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W5500S2E serial to Ethernet module
W5500S2E module series support both data pass-through mode and AT data transfer mode. It
supports TCP server, TCP clients and UDP 3 operation mode. Serial baud rate can be as high as
1.152Mbps. It can be configured by PC configuration utility, web page and AT command.
The unparalleled and robust of W5500S2E integrated 32bit MCU with the hardwired TCP/IP
Ethernet chip W5500. Accompanied by a vast functionalities, makes the family of products the
ideal choice, both for new design projects or an upgrading a current platform.
Features
 Support dual mode: “Data pass-through” and “AT data transfer”
 Support TCP server, TCP client and UDP operating modes
 Support RS-485 enable pin of an external RS-485 transceiver
 Flexible data packet condition for the serial interface
 As DHCP client to automatically acquire IP address
 As DNS client to lookup domain name
 Support Modbus RTU/ASCII to Modbus TCP/UDP
 Support Modbus over TCP/UDP
 Support NetBIOS for easy access of web configuration page
 Support three configuration method: serial AT command, PC software and web page
 Support local and remote firmware upgrade
 Support “Keep-Alive” to guarantee TCP connection
Specification
 10/100Mbps Ethernet interface
 Serial interface: 3.3V TTL：TXD, RXD, CTS, RTS, GND
 Baud Rate: From 1.2Kbps to 1.152Mbps with 16 common values
 Data Bit: 7, 8
 Stop Bit: 0.5, 1, 1.5, 2
 Parity: None, Even, Odd
 Flow Control: None, CTS/RTS
 Power supply:
 W5500S2E-S1: DC 3.3V
 W5500S2E-Z1: DC 5.0V
 W5500S2E-R1: DC 3.3V
 Size: L x W x H (mm)
 W5500S2E-S1: 34.00×24.00×12.40
 W5500S2E-Z1: 44.45×31.75×15.75
 W5500S2E-R1: 44.45×31.75×23.00
 Operating temperature: -40℃ ~ +85℃ (Industrial Grade)
 Storage environment: -40℃ ~ +85℃, 5 ~ 95% RH
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W5500S2E serial to Ethernet module
Document Revision History
Version Date Remarks
V1.0 2018/10/05 Official Release
V1.1 2019/03/29
Add new “Data transfer command”
Revised structure of document
Remove obsolete information
Updated all images
V1.1.1 2019/04/09 Add electrical characteristics for W5500S2E-Z1 for VIN =5.0V
V1.1.2 2019/05/29 Chapter 2.1.1 add W5500S2E-S1 pin description & figure of ACK_LED
Chapter 2.2 update W5500S2E reference schematics
Copyright notice
Copyright © WIZnet H.K. Ltd. All rights reserved.
Contact E-mail: supports@wiznet.hk
For more information, please visit: http://www.wiznet.com.hk/
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W5500S2E serial to Ethernet module
Table of Contents
1 Introduction ........................................................................................... 1
1.1 Overview ............................................................................................... 1
1.2 Specifications ......................................................................................... 2
2 Hardware description ............................................................................ 6
2.1 Pin definition.......................................................................................... 6
2.2 WIZS2E-EVB breakout board ................................................................... 9
2.3 Quick testing guide............................................................................... 12
3 Operating modes ................................................................................. 13
3.1 TCP server mode .................................................................................. 13
3.2 TCP client mode ................................................................................... 13
3.3 UDP mode ........................................................................................... 13
3.4 Modbus mode ...................................................................................... 14
4 Data transfer mode .............................................................................. 15
4.1 Data pass-through mode ...................................................................... 15
4.2 AT data transfer command mode ........................................................... 15
4.3 How to enter “Data pass-through mode“ ................................................ 16
5 WIZS2E ConfigTool .............................................................................. 16
5.1 Reading module information.................................................................. 16
5.2 Modify the device settings ..................................................................... 17
5.3 Reset the module ................................................................................. 17
5.4 Useful features ..................................................................................... 17
6 Introduction of AT command ............................................................... 19
6.1 AT command overview .......................................................................... 19
6.2 AT command responds ......................................................................... 19
6.3 Entering AT command Mode ................................................................. 20
6.4 AT command list .................................................................................. 20
6.5 AT command details ............................................................................. 24
6.6 AT Data transfer command ................................................................... 41
6.7 AT command script examples ................................................................ 45
7 Web configuration ............................................................................... 47
7.1 Login page .......................................................................................... 47
7.2 Basic Settings ...................................................................................... 48
7.3 Advance Options .................................................................................. 50
7.4 Management ........................................................................................ 52
8 Factory reset ........................................................................................ 53
8.1 By ConfigTool ....................................................................................... 53
8.2 By using AT command .......................................................................... 53
8.3 By hardware ........................................................................................ 53
9 Firmware upgrade ............................................................................... 54
9.1 Firmware upgrade by WIZS2E ConfigTool ............................................... 54
9.2 Firmware upgrade by web page............................................................. 55
Disclaimers ................................................................................................ 56
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W5500S2E serial to Ethernet module
1 Introduction
1.1 Overview
W5500S2E series modules have the following different part number which depends on
different footprint and connectors:
Table 1-1 W5500S2E type comparison
P/N Photos Features
W5500S2E-S1
1. Dimension: 34.00×24.00×12.40 (mm)
2. Network socket type: Ethernet transformer
3. Voltage input DC 3.3V
4. Operating temperature: -40 °C ~ +85 °C
W5500S2E-Z1
1. Dimension: 44.45×31.75×15.75 (mm)
2. Network socket type: Ethernet transformer
3. Voltage input DC 5.0V
4. Operating temperature: -40 °C ~ +85 °C
W5500S2E-R1
1. Dimension: 44.45×31.75×23.00 (mm)
2. Network socket type: RJ-45
3. Voltage input DC 3.3V
4. Operating temperature: -40 °C ~ +85 °C
Configuration methods
W5500S2E provides three configuration methods:
 User can configure the module by the WIZS2E ConfigTool utility, which is software
running in Windows® environment. For details, please refer to chapter 4.
 Main MCU can send AT command through serial port for parameter configuration or
user can send the AT command through serial port by a serial terminal software. For
details, please refer to chapter 6.
 Web page configuration allows user to configure the module through web browsers
in the same local area network. For details, please refer to chapter 7.
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1.2 Specifications
Electrical characteristics
Voltage and current characteristics
The following tables show the voltage and current under 25oC environment
Table 1-2 W5500S2E-S1 & W5500S2E-R1 Electrical characteristics (VIN=3.3V)
Ratings
Symbol Types
Min Typical Max Unit
VIN Module voltage 2.97 3.3 3.6 V
IIN Module current 118 106 97 mA
Table 1-3 W5500S2E-Z1 Electrical characteristics (VIN=5.0V)
Ratings
Symbol Types
Min Typical Max Unit
VIN Module voltage 4.4 5.0 6 V
IIN Module current 79 70 58 mA
Current characteristics
Table 1-4 W5500S2E-S1 & W5500S2E-R1 Current characteristics (VIN=3.3V)
Working Mode Ratings (mA)
Standby 101
Normal communication 106
Table 1-5 W5500S2E-Z1 Current characteristics (VIN=5.0V)
Working Mode Ratings (mA)
Standby 65
Normal communication 70
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Dimension
Please refer to the figures below which shows the dimension of the module.
W5500S2E-S1 layout and dimension
Figure 1-1 W5500S2E-S1 dimension - top view
Figure 1-2 W5500S2E-S1 dimension - side view
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W5500S2E-Z1 layout and dimension
Figure 1-3 W5500S2E-Z1 dimension - top view
A power LED locates on the top of each module with a small + sign marking above.
Figure 1-4 W5500S2E-Z1 dimension - side view
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W5500S2E-R1 layout and dimension
Figure 1-5 W5500S2E-R1 dimension - top view
A power LED locates on the top of each module with a small + sign marking above.
Figure 1-6 W5500S2E-R1 dimension - side view
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2 Hardware description
2.1 Pin definition
2.1.1 W5500S2E-S1 pinout and pin definition
Table 2-1 W5500S2E-S1 pin definition
Pin. Pin Name I/O Description
1 LINK_LED O Ethernet link indicator
2 ACK_LED O MAC layer ACK indicator
3 DATA_LED O
Ethernet & serial status indicator
Change status while data channel changes
4 TXOP O Ethernet TXOP signal
5 TXON O Ethernet TXON signal
6 RXIP I Ethernet RXIP signal
7 RXIN I Ethernet RXIN signal
8 RESET I Reset pin (pull down over 200ms)
9 CTS I UART flow control CTS signal pin
RTS O UART flow control RTS signal
10
485EN
Figure 2-1 W5500S2E-S1 pinout
O Configurable as 485 enable pin
(This function is supported by firmware
version is 2.3 or above)
11 TXD O UART TXD signal
12 RXD I UART RXD signal
13 GND - Ground
14 VCC - DC 3.3V
15 × - -
16 × - -
17 × - -
18 DEFAULT I Factory reset pin (pull down over 3s)
19 TCP_STATUS
O TCP connection status indicator
High: TCP connection Close
Low: TCP connection Establish
(This function is supported by firmware
version is 2.3 or above)
20 × - -
21 × - -
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2.1.2 W5500S2E-Z1 pinout and pin definition
Table 2-2 W5500S2E-Z1 pin definition
Pin Pin Name I/O Function
1 TXOP O Ethernet TXOP signal
2 TXON O Ethernet TXON signal
3 RXIP I Ethernet RXIP signal
4 RXIN I Ethernet RXIN signal
5 DATA_LED O
Ethernet & serial status indicator
Change status while data channel
changes
6 TXD O UART TXD signal
7 RXD I UART RXD signal
RTS O UART flow control RTS signal
8
485EN O
Configurable as 485 enable pin
(This function is supported by firmware
version is 2.3 or above)
9 DEFAULT I Factory reset pin (pull down over 3s)
10 RESET I Reset pin (pull down over 200ms)
Figure 2-2 W5500S2E-Z1 pinout
11 GND - Ground
12 GND - Ground
13 VCC - DC 5.0V
14 VCC - DC 5.0V
15 LINK_LED O Ethernet link indicator
16 × - -
17 × - -
18 × - -
19 × - -
20 × - -
21 CTS I UART flow control CTS signal pin
22 TCP_STATUS O
TCP connection status indicator
High: TCP connection Close
Low: TCP connection Establish
(This function is supported by firmware
version is 2.3 or above)
23 × -- --
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2.1.3 W5500S2E-R1 pinout and pin definition
Table 2-3 W5500S2E-R1 pin definition
Pin Pin Name I/O Function
1 × - -
2 × - -
3 × - -
4 × - -
5 DATA_LED O
Ethernet & serial status indicator
Change status while data channel
changes
6 TXD O UART TXD signal
7 RXD I UART RXD signal
RTS O UART flow control RTS signal
8
485EN O
Configurable as 485 enable pin
(This function is supported by firmware
version is 2.3 or above)
Figure 2-3 W5500S2E-R1 pinout
9 DEFAULT I Factory reset pin (pull down over 3s)
10 RESET I Reset pin (pull down over 200ms)
11 GND - Ground
12 GND - Ground
13 VCC - DC 3.3V
14 VCC - DC 3.3V
15 LINK_LED O Ethernet link indicator
16 × - -
17 × - -
18 × - -
19 × - -
20 × - -
21 CTS I UART flow control CTS signal pin
22 TCP_STATUS O
TCP connection status indicator
High: TCP connection Close
Low: TCP connection Establish
(This function is supported by firmware
version is 2.3 or above)
23 × -- --
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2.2 WIZS2E-EVB breakout board
The WIZS2E-EVB evaluation board provides a simple and speedy connection for
evaluating the W5500S2E-Z1 and the W5500S2E-R1. The connectors and I/O are shown
below.
W5500S2E pin header
W5500S2E
Power supply
LED
WIZS2E-EVB
Power supply
RJ-45
TTL pin header
Default button Reset button
Figure 2-4 WIZS2E-EVB breakout board
WIZS2E-EVB evaluation board integrates RJ45, UART (TTL) and mini USB interfaces.
 RJ45 (J5) interface pin assignment “×” indicate for not connected
Pin Signal Pin Signal
1 RXIN 5 ×
2 RXIP 6 TXOP
3 TXON 7 ×
4 × 8 ×
 P2 interface pin Assignment
Pin Signal Pin Signal
1 5.0V 5 3.3V
2 GND 6 GND
3 TXD 7 RTS
4 RXD 8 CTS
 The mini USB Interface (J6) pin assignment
Note: This mini USB connector is only for the power supply 5V DC of the evaluation board.
Pin Signal Pin Signal
1 5.0V 4 ×
2 × 5 GND
3 × 7 RTS
 SW3 is power supply selection jumper for 5V or 3.3V; please short the corresponding
voltage to the Vcc pin. Pin Signal Description
5V 5.0V Short with Vcc for W5500S2E-Z1
Vcc Vcc Short with 5V or 3V3 for Vcc voltage-
3V3 3.3V Short with Vcc for W5500S2E-R1
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1 . WIZSE evaluation board button description
Table 2-4 WIZS2E-EVB breakout board button description
Button Description
SW1 (default) Press button over 3 seconds for factory reset
SW2 (RESET) Hardware reset button
2 . WIZS2E-EVB breakout board LED description
Table 2-5 WIZS2E-EVB breakout board LED description
LED Description
ACT Ethernet ACT indicator
LINK Ethernet LINK indicator
DATA
Ethernet & serial status indicator
Change status while data channel changes
1 . W5500S2E-S1 reference schematic
Figure 2-5 W5500S2E-S1 reference schematic
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2 . W5500S2E-Z1 reference schematic
Figure 2-6 W5500S2E-Z1 reference schematic
3 . W5500S2E-R1 reference schematic
Figure 2-7 W5500S2E-R1 reference schematic
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2.3 Quick testing guide
WIZS2E module can convert any devices with serial interface to have Ethernet
connectivity easily. It is recommended using the WIZS2E-EVB breakout board for the
evaluation testing for W5500S2E module. First insert the W5500S2E onto the
WIZS2E-EVB. Then connect the serial port of the WIZS2E-EVB using a serial-to-USB
dongle or cable to connect the USB port of the PC. Besides, connect the Ethernet port of
the WIZS2E-EVB to the Ethernet port of the PC with Ethernet cable. With this setup, the
W5500S2E becomes the bridge between the serial port and the Ethernet port.
Figure 2-8 W5500S2E module testing evaluation block diagram
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3 Operating modes
W5500S2E module supports TCP server, TCP client, and UDP and Modbus modes. The
followings demonstrate these operating modes.
3.1 TCP server mode
TCP
Client
TCP/IP
network Seri
Serial
TCP
Server
W5500S2E
(TCP server)
Figure 3-1 TCP server mode diagram
In TCP server mode, W5500S2E listens on a local port and waiting for the connection
from a TCP client. They can start communication each other after link established.
3.2 TCP client mode
TCP/IP
network User device
Ser
Serial
W5500S2E
(TCP client)
Figure 3-2 TCP client mode diagram
In TCP client mode, W5500S2E connects to a preset TCP server. If failure to connect, it
can be configured to re-connect continuously. They can start communication each other
after link established.
3.3 UDP mode
User device
UDP peer TCP/IP
network Ser
Serial
User device
W5500S2E
(UDP peer)
Figure 3-3 UDP mode diagram
In UDP mode, W5500S2E acts as an UDP peer to send data to another preset UDP peer.
W5500S2E can also receive data from other UDP peers.
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3.4 Modbus mode
Modbus TCP/UDP
Modus
TCP/UDP
device
TCP/IP
network Ser
Serial
W5500S2E User device
Modus RTU/ASCII
Figure 3-4 Modbus mode diagram
In Modus mode, W5500S2E acts as a bridge between Modus RTU/ASCII protocols to
Modbus over TCP/UDP protocols. Also W5500S2E can also support Modbus over TCP/UDP
communication.
Note: The Modus function of W5500S2E is only valid under “Data pass-through mode”.
“AT data transfer” mode does not support Modus function.
This function is supported by firmware version is 2.3 or above
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W5500S2E serial to Ethernet module
4 Data transfer mode
W5500S2E series serial-to-Ethernet module has two mode of data transfer mode to
choose from. It includes “Data pass-through mode” & “AT data transfer command mode”.
Whereas “AT data transfer command mode” is supported by firmware version 2.3 and
above
4.1 Data pass-through mode
Data pass-through mode of W5500S2E has the following characteristics
1. To configure W5500S2E to transmit data, parameters need to be configured in AT
command before switching into “data pass-through mode”
2. Module will enter the preset mode and parameter after module entered into “data
pass-through mode”
① In TCP server mode, it will listen on a local port and wait for a TCP client
connection
② In TCP client mode, it will connect to the preset remote TCP server until
connection establish
③ In UDP mode, no connection is needed. Module will wait for the data
3. After establish TCP connection or entered UDP mode, data will be pass-through
between the serial and Ethernet ports according to the preset settings
4. If the TCP connection is closed, module will act as below
① In TCP server mode, it will listen on a local port again and wait for a TCP client
connection
② In TCP client mode, it will reconnect to the preset remote TCP server
5. If the MCU would like to change the parameters. It is need to exit the “data
pass-through mode” and enter into AT command mode for configure the parameters
4.2 AT data transfer command mode
AT data transfer command mode of W5500S2E has the following characteristics
1. To configure W5500S2E to transmit data, parameters can be configured in AT
command mode. Sending data in “AT data transfer command mode” does not
require switching mode
2. After configure the parameter, data can be send directly in AT command mode for
TCP or UDP communication
① In TCP server mode, it will listen on a local port and wait for a TCP client
connection
② In TCP client mode, it will connect to the preset remote TCP server. If
connection cannot be establish within 3s. It is need to resend command to
reconnect.
③ In UDP mode, no connection is needed. Module will wait for the data
3. After establish TCP connection or entered UDP mode, data can be sent or received
for single packet at a time only
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4. 5. If TCP connection is close. It is need to reconnected using AT command.
If parameters changes are needed, it can be configured directly using AT command.
Note: “AT data transfer command mode” is supported by firmware version is 2.3 or above
4.3 How to enter “Data pass-through mode“
There is three ways for entering the “data pass-through mode”.
1 By AT command (For details, please refer to chapter 6 “RESET & “EXIT” command)
2 Web page (For details, please refer to chapter 7)
3 WIZS2E ConfigTool utility (For details, please refer to chapter 5)
5 WIZS2E ConfigTool
WIZS2E ConfigTool is Windows® software compatibles to all WIZS2E modules. It can be
used to read, configure all settings and firmware updating for WIZS2E modules.
Note: It is recommended to turn off the firewall before using the ConfigTool. Also, there
must no conflict of IP address in the same LAN.
5.1 Reading module information
When starting ConfigTool or clicking the button, WIZS2E ConfigTool will
search all WIZS2E modules that have connected in the same LAN. Figure below shows the
search result with one module in the network. By selecting the MAC address in the list,
you can read and configure all the parameters of this module.
Figure 5-1 WIZS2E ConfigTool “Basic Settings”
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Figure 5-2 WIZS2E ConfigTool “Advance Options”
5.2 Modify the device settings
If there is any updated parameter, please click configuration and restart.
5.3 Reset the module
First click the “Reset” button and then to click the “Reset Now!” button
to reset the module without saving any setting
5.4 Useful features
button to save your
Switching PC network interface
If the PC has more than one network interface, user can select the network interface
which connecting to the module. By selecting “Update IP list!” the
interface list will be refreshed.
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Right-click context menu
WIZS2E ConfigTool provides additional options via the context menu. When right-click on
a device in the list on the left side, the function list will appear as shown in the figure
below.
1. Expand/collapse all device details
2. The device list can be sorted by MAC address or device type or device name
3. The function “Search again!” is for users to keep the original device list unchanged.
Newly searched device would be list under the current device list.
Figure 5-3 Right mouse click menu
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6 Introduction of AT command
6.1 AT command overview
AT command can be sent to the serial port of W5500S2E running in AT command mode.
AT command is case insensitive. AT command is always starting with string “AT” and ends
with “\r\n”. Each command has specific response and parameter format.
Below are difference types of AT command:
1. Commands without parameter
Format: AT+<command>\r\n
No extra parameters or symbol after the command.
Example
Command: AT+EXIT\r\n
Response: OK\r\n .
2. Commands with parameter
Format: AT+<command>=<parameter>\r\n
These commands are for configure certain settings.
Example
Command: AT+ECHO=1\r\n
Response: [ECHO] Value is: 1\r\n OK\r\n
3. Read commands
Format: AT+<command>?\r\n
These commands read the current settings value.
Example
Command: AT+ECHO?\r\n
Response: [ECHO] Value is: 1\r\n OK\r\n
Based on different AT command sent, W5500S2E will return with corresponding response.
The response type is shown in the table below.
6.2 AT command responds
Table 6-1 AT command responds list
Response type Response Description
Command Invalid\r\nERROR\r\n Invalid command
Error message
<Error Info>\r\n
Invalid parameter
or in the wrong mode
OK\r\n
Success message
Command is executed successfully
[Command] Value is:<value>\r\nOK\r\n
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6.3 Entering AT command Mode
W5500S2E has two modes, “AT command mode” and “Data pass-through mode”. In “AT
command mode”, W5500S2E is waiting for the AT Command from the serial port.
Different settings can be set by serial terminal software or through the serial port of the
MCU.
Note: The existing connections will be closed when entering “AT command mode”.
When W5500S2E is in “AT command mode” mode, sending “AT\r\n”, it will respond with
“OK\r\n” if it is working correctly.
In “Data pass-through mode”, W5500S2E will not detect any AT command sending to the
serial port. All messages received by the serial port will be regarded as data except the
special “+++” code below, which switching the module into AT command mode.
Note: ”+++” code rules - It is needed to send “+” symbol continuously in 3 times through
the serial port with 1 second time gap both before and after the “+++”.
6.4 AT command list
W5500S2E module serial-to-Ethernet module supports serial AT command for
configuration. Also it support sending data through the AT command mode.
“AT data transfer command” and “save” command are supported by firmware
version 2.3 and above.
6.4.1 AT setting command list
AT setting command is used for configure or read the parameter of W5500S2E.
AT command has attribute R: Read, W: Set, R/W: Read and set
Table 6-2 AT command list
Type
Command Function
Attribute
Max
Parameters
length
AT Terminal check R - -
ECHO Enable or disable echoing R/W 1
0: Echo off
1: Echo on (default)
DEBUGMSGEN Debug message R/W 1
0: Disable
1: Enable (default)
Control command
NAME Module name R/W 15 Must be numbers, alphabets or the
combination of both
PASS Module password R/W 15 Must be numbers, alphabets or the
combination of both (Default: admin)
DEFAULT Reset to factory default W 15 Module password
RESET Save and restart module W 15 Reset if parameter equals to password
EXIT Exit AT command W - -
SAVE Save settings W - -
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Type
Command Function
Attribute
Max
length Parameters
START_MODE Start mode R/W 1 0: AT command mode (default)
1: Data pass-through mode
C1_OP Operating mode R/W 1
Module settings command
0: TCP server mode (default)
1: TCP client mode
2: UDP mode
16: Modbus RTU-TCP Server
17: Modbus RTU-TCP Client
18: Modbus RTU-UDP
32: Modbus ASCII-TCP Server
33: Modbus ASCII-TCP Client
34: Modbus ASCII-UDP
48: Modbus RTU over TCP Server
49: Modbus RTU over TCP Client
50: Modbus RTU over UDP
64: Modbus ASCII over TCP Server
65: Modbus ASCII over TCP Client
66: Modbus ASCII over UDP
(The Modbus functions are supported by
firmware version is 2.3 or above)
IP_MODE IP configuration method R/W 1 0: Static IP mode (default)
1: DHCP mode
IP IP address R/W 15 Default: 192.168.1.88
MARK Subnet mask R/W 15 Default: 255.255.255.0
GATEWAY Gateway R/W 15 Default: 192.168.1.1
DNS DNS server address R/W 15 Default: 114.114.114.114
C1_PORT Local port number R/W 5 1 ~ 65,535; Default: 5000
C1_BIND Local port binding R/W 1 Valid only in TCP Client mode:
0: Disable (default) 1: Enable
DNSEN DNS for remote host R/W 1 0: Disable (default) 1: Enable
C1_CLI_IP1 Remote host IP address R/W 15 Default: 192.168.1.99
C1_CLI_PP1 Remote host port number R/W 5 1 ~ 65,535; Default: 5000
DOMAIN Remote host name R/W 32 Default: www.iwiznet.cn
RECONTIME Reconnection interval R/W 5
Valid only in TCP client mode
Value range: 0~60000; Unit: ms
Default: 0 (reconnect immediately)
NETBIOS NetBIOS R/W 1 0: Disable (default)
1: Enable
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Type
Command Function
Attribute
Max
length Parameters
COM1 Serial parameter R/W 10 Default: 9.0.0.1.0
C1_BAUD Baud rate index R/W 2
0: 1,200
1: 2,400
2: 4,800
3: 9,600
4: 14,400
5: 19,200
6: 38,400
7: 56,000
8: 57,600
9: 115,200
10: 128,000
11: 234,000
12: 256,000
13: 468,400
14: 921,600
(default)
15: 115,200
C1_DATAB Data bit index R/W 1 0: 7 bit 1: 8 bit (default)
C1_STOPB Stop bit R/W 1
0: 0.5
1: 1 bit (default)
2: 1.5
3: 2
C1_PARITY Parity bit R/W 1 0: Disable (default) 1: Odd 2: Even
C1_SER_C
Serial flow control /
RS-485 enable output R/W 1
0: Disable (default)
1: Enable CTS/RTS hardware flow control
2: Enable 485EN pin
C1_BUF_CLS Clear Buffer if Connected R/W 1
Valid only in TCP modes
0: Disable (default)
1: Enable
Serial settings command
C1_SER_LEN Serial data packing length R/W 4 Value range: 0~2048 byte
Default: 0 (Disable)
C1_SER_T Serial data packing Nagle
wait time (ms) R/W 5 Value range: 0~60000, unit: ms;
Default: 0 (Disable)
C1_IT Inactivity timeout (ms) R/W 5
Valid only in TCP modes
Value range: 0 ~ 60000, unit: ms;
Default: 0 (disable this function)
C1_TCPAT TCP keepalive interval R/W 3
Valid only in TCP modes
Value range: 0~255, unit 5s;
Default: 0 (Disable)
C1_LINK_P TCP password
authentication R/W 1
Valid only in TCP server mode
0: Disable (Default)
1: Enable
C1_LINK_T Connection Condition R/W 1
Valid only in TCP client mode
0: Connect when power on (default)
1: Connect when receiving data from serial
C1_LINK_M Send Hello Message R/W 1
Valid only in TCP modes
0: Disable (Default)
1: Send module name
2: Send MAC address
3: Send IP address
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Type
Command Function
Attribute
Max
length Parameters
C1_SEND_NUM Serial sent byte R - Range: 0 ~ 4,294,967,295
C1_RCV_NUM Serial received byte R - Range: 0 ~ 4,294,967,295
NETSEND Network sent byte R - Range: 0 ~ 4,294,967,295
NETRCV Network received byte R - Range: 0 ~ 4,294,967,295
Management command
PRE List preset values R - -
LIST List all commands R - -
RUNTIME Module uptime R - -
VER Firmware version R - -
MAC MAC address R - -
SN Serial number R - -
TYPE Module P/N R - -
WEB_PORT Web configuration port
number R/W 5 1 ~ 65,535; Default: 80
6.4.2 AT data transfer command list
“AT data transfer command” is supported by firmware version 2.3 and above.
Table 6-3 AT command list
Type
Command Function
Attribute
Max
Parameters
length
LINK PHY link status R -
0: PHY link not connect
1: PHY link connected
LISTEN Listening on TCP W - -
CONNECT Initiate TCP connection W - -
Data transfer command
TCP_STATUS TCP connection status R -
0: TCP closed
1: TCP connected
UDP Establish UDP W - -
SEND Send the length W 4 Range: 0 ~ 2048
Default: 0 (any length)
RCV Receive the length W 4 Range: 0 ~ 2048
Default: 0 (any length)
RLEN Receive data length R - Remaining length to be received
DISCON Close socket W - -
CLEAR Clear network receiving
buffer
W - -
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6.5 AT command details
6.5.1 Control command
AT (Terminal check)
Command format Parameters Usage
AT Nil Read
Response OK\r\n
Description If module is in AT command mode, return is value above
Example Command: AT\r\n
Response: OK\r\n
It will check if the module if it is working properly in AT command mode.
ECHO (Enable or disable echoing)
Command format Parameters Usage
AT+ECHO? Nil Read
AT+ECHO=<parameter>
0: echo off
1: echo on (default)
Set
Response [ECHO] Value is:<value>\r\nOK\r\n
Example Command: AT+ECHO?\r\n
Response: [ECHO] Value is:1\r\nOK\r\n
In AT command mode, echo on means the module could directly respond any input command line to the
serial interface. Thus, this option may help users more easily through serial terminal software manually.
However, this may increase the difficulty to parse the return output if the serial is connected to an MCU
in an embedded system. Turn echo off in this case.
DEBUGMSGEN (Debug message)
Command format Parameters Usage
AT+DEBUGMSGEN? Nil Read
AT+DEBUGMSGEN=<parameter>
0: Disable
1: Enable (default)
Set
Response [DEBUGMEGEN] Value is: <value>\r\nOK\r\n
Example Command: AT+DEBUGMSGEN=1\r\n
Response: [DEBUGMSGEN] Value is:1\r\nOK\r\n
This will enable debug message sending to the serial interface. Thus, this option may help users more
easily through serial terminal software manually.
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NAME (Module name)
Command format Parameters Usage
AT+NAME? Nil Read
AT+NAME=<parameter>
User defined device name. It must be numbers, alphabets or the
combination of both. Maximum length is 15 byte. Cannot be null
Default: Module P/N
Set
Response [NAME] Value is:<value>\r\nOK\r\n
Example Command: AT+NAME=User1\r\n
Response: [NAME] Value is:User1\r\nOK\r\n
Module name can be user defined to identify the different devices in their application.
Note: When using NetBIOS name function, device name should follow the “AT+NETBIOS” naming
rules.
PASS (Module password)
Command format Parameters Usage
AT+PASS? Nil Read
AT+PASS=<parameter>
User define password. It must be numbers, alphabets or the
combination of both. Maximum length is 15 byte. It is case
sensitive and cannot be null. Default: admin
Set
Response [PASS] Value is:<value>\r\nOK\r\n
Example Command: AT+PASS=Admin1\r\n
Response: [PASS] Value is:Admin1\r\nOK\r\n
The password is used for factory reset, TCP password authentication, Web page login and the AT
command “DEFAULT” and “RESET”.
Note:
Factory reset – When factory reset by AT command, correct password must be input. Please refer to
the “Default” command for details.
TCP Password authentication – If enable, the exact password need to be sent in the first packet. If
password is correct, communication can be started; otherwise connection closed. For details, please
refer to the C1_LINK_P command.
DEFAULT (Reset to factory default)
Command format Parameters Usage
AT+DEFAULT=<parameter> Module password; Default: admin Set
Response OK\r\n
Example Command: AT+DEFAULT=admin\r\n
Response: OK\r\n
 Exact password must be input to execute this command
 When this command is successfully executed, the module restores all settings to factory default
and enters to AT command mode.
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RESET (Save and restart the module)
Command format Parameters Usage
AT+RESET=<parameter> Module password; Default: admin Set
Response OK\r\n
Example Command: AT+RESET=admin\r\n
Response: OK\r\n
 Exact password must be input to execute this command
 It will save the current settings
 Restart the module so that the setting is effective
 The module will be in preset “Start mode” after reset.
EXIT (Save and exit command mode)
Command format Parameters Usage
AT+EXIT Nil Execute
Response OK\r\n
Example Command: AT+EXIT\r\n
Response: OK\r\n
 It will save the current settings
 Restart the module and make the settings take effect
 Module will be entered into “Data pass-through mode”
SAVE (Save settings)
Command format Parameters Usage
AT+SAVE Nil Execute
Response OK\r\n
Example Command: AT+SAVE\r\n
Response: OK\r\n
 It will save the current settings
 Make the settings take effect
 After execute this command, the module will be still in “AT command mode”. This is for save the
settings in the AT data transfer command mode.
Note: This command is supported by firmware version 2.3 and above.
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6.5.2 Module settings command
START_MODE (Start mode)
Command format Parameters Usage
AT+START_MODE? Nil Read
AT+START_MODE=<parameter> 0: AT command mode (default)
1: Data pass-through mode
Set
Response [START_MODE] Value is:<value>\r\nOK\r\n
Example Command: AT+START_MODE=1\r\n
Response: [START_MODE] Value is:1\r\nOK\r\n
This defines the starting mode after power on or reboot or executing the “RESET” command.
C1_OP (Operating mode)
Command format Parameters Usage
AT+C1_OP? Nil Read
AT+C1_OP=<parameter>
0: TCP Server (Default)
1: TCP Client
2: UDP
Set
Response [C1_OP] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_OP=1\r\n
Response: [C1_OP] Value is:1\r\nOK\r\n
It defines the operating mode for data transfer. If in AT data transfer command mode and using this
command to change the operating mode. It is needed to use the command “DISCON” command to close
the TCP/UDP communication first.
IP_MODE (IP configuration mode)
Command format Parameters Usage
AT+IP_MODE? Nil Read
AT+IP_MODE=<parameter> 0: Static IP mode (default)
1: DHCP mode
Set
Response [IP_MODE] Value is:<value>\r\nOK\r\n
Example Command: AT+IP_MODE=1\r\n
Response: [IP_MODE] Value is:1\r\nOK\r\n
In static IP mode, the IP address, gateway, subnet mask and DNS server address are required
configure by the user. In DHCP mode, device will get all above IP parameters from the DHCP server.
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IP (IP address)
Command format Parameters Usage
AT+IP? Nil Read
AT+IP=<parameter> Default: 192.168.1.88 Set
Response [IP] Value is:<value>\r\nOK\r\n
Example Command: AT+IP=192.168.1.88\r\n
Response: [IP] Value is:192.168.1.88\r\nOK\r\n
The IP address has format in human-readable notations for IPv4, such as 172.16.254.1; maximum
length of IP address is 15 bytes. This value is effective only if IP configuration mode (IP_MODE) is in
“Static IP mode”.
MARK (Subnet mask)
Command format Parameters Usage
AT+MARK? Nil Read
AT+MARK=<parameter> Default: 255.255.255.0 Set
Response [MARK] Value is:<value>\r\nOK\r\n
Example Command: AT+MARK=255.255.255.0\r\n
Response: [MARK] Value is:255.255.255.0\r\nOK\r\n
The subnet mask format in human-readable notations for IPv4, such as 255.255.255.0; maximum
length is 15 bytes. This value is effective only if IP configuration mode (IP_MODE) is in “Static IP
mode”.
GATEWAY (Gateway)
Command format Parameters Usage
AT+GATEWAY? Nil Read
AT+GATEWAY=<parameter> Default: 192.168.1.1 Set
Response [GATEWAY] Value is:<value>\r\nOK\r\n
Example Command: AT+GATEWAY=192.168.1.1\r\n
Response: [GATEWAY] Value is:192.168.1.1\r\nOK\r\n
The gateway IP address has format in human-readable notations for IPv4, such as 172.16.254.1;
maximum length of IP address is 15 bytes. This value is effective only if IP configuration mode
(IP_MODE) is in “Static IP mode”.
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DNS (DNS server address)
Command format Parameters Usage
AT+DNS? Nil Read
AT+DNS=<parameter> DNS server address, default:
114.114.114.114
Set
Response [DNS] Value is:<value>\r\nOK\r\n
Example Command: AT+DNS=1.1.1.1\r\n
Response: [DNS] Value is: 1.1.1.1\r\nOK\r\n
DNS server address format is separated into 4 sections; each section is a decimal value and using a
dot to separate. The value range for each section is 0-255 therefore the maximum value Dimension
for DNS server address is 15 bytes. This command could not accept xxx.xxx.xxx.0 or xxx.xxx.xxx.255
values input.
C1_PORT (Local port number)
Command format Parameters Usage
AT+C1_PORT? Nil Read
AT+C1_PORT=<parameter> Local port number, Default: 5000 Set
Response [C1_PORT] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_PORT=5000\r\n
Response: [C1_PORT] Value is:5000\r\nOK\r\n
This command is only valid in TCP server and UDP mode. It defines the port number of the module. The
module will use this port number to communicate with other devices. The value range is 0 to 65535.
Note: Please avoid using the same port number for web page configuration, which the port number
default is 80)
C1_BIND (Local port binding)
Command format Parameters Usage
AT+C1_BIND? Nil Read
AT+C1_BIND=<parameter> 0: Disable (Default)
1: Enable
Set
Response [C1_BIND] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_BIND=1\r\n
Response: [C1_BIND] Value is:1\r\nOK\r\n
This command is only valid in TCP client mode, this will enable the blinding to a fixed local port using
command “C1_PORT”
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DNSEN (DNS enable)
Command format Parameters Usage
AT+DNSEN? Nil Read
AT+DNSEN=<parameter> 0: Disable (Default)
1: Enable
Set
Response [DNSEN] Value is:<value>\r\nOK\r\n
Example Command: AT+DNSEN=1\r\n
Response: [DNSEN] Value is:1\r\nOK\r\n
This command is only valid in TCP client and UDP modes.
Note:
 If this is enabled and “DOMAIN” is set, “C1_CLI_IP1” command will be invalid. Module will be
communicated with the host defined by “Domain”.
 If this is disabled and “C1_CLI_IP1” is set, “DOMAIN” command will be invalid. Module will be
communicated with the IP defined by “C1_CLI_IP1”.
C1_CLI_IP1 (Remote host IP address)
Command format Parameters Usage
AT+C1_CLI_IP1? Nil Read
AT+C1_CLI_IP1=<parameter> Default: 192.168.1.99。 Set
Response [C1_CLI_IP1] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_CLI_IP1=192.168.1.99\r\n
Response: [C1_CLI_IP1] Value is:192.168.1.99\r\nOK\r\n
This command is only valid
 In TCP client mode or UDP mode
 “DNSEN” is enabled
It sets the remote IP address to communicate with W5500S2E.
C1_CLI_PP1 (Remote host port number)
Command format Parameters Usage
AT+C1_CLI_PP1? Nil Read
AT+C1_CLI_PP1=<parameter> Range: 1 ~ 65,535, Default: 5000。 Set
Response [C1_CLI_PP1] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_CLI_PP1=5000\r\n
Response: [C1_CLI_PP1] Value is:5000\r\nOK\r\n
This command is valid only in TCP server and UDP mode.
Note: Please prevent to use common port numbers for avoiding conflict with other service on the remote
host.
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DOMAIN (Remote host name)
Command format Parameters Usage
AT+DOMAIN? Nil Read
AT+DOMAIN=<parameter>
Remote host domain name
default: www.iwiznet.cn
Maximum length is 32 bytes
Set
Response [DOMAIN] Value is:<value>\r\nOK\r\n
Example Command: AT+DOMAIN=www.iwiznet.cn\r\n
Response: [DOMAIN] Value is:www.iwiznet.cn\r\nOK\r\n
This command is only valid
 In TCP client mode or UDP mode
 “DNSEN” is enabled
This command sets the remote host server name.
RECONTIME (Reconnection interval)
Command format Parameters Usage
AT+RECONTIME? Nil Read
AT+RECONTIME=<parameter> Range: 0~60000 Unit: ms Set
Default: 0 (reconnect immediately)
Response [RECONTIME] Value is:<value>\r\nOK\r\n
Example Command: AT+RECONTIME=1000\r\n
Response: [RECONTIME] Value is:1000\r\nOK\r\n
This command is only valid in TCP client mode & “data pass-through mode”.
This command configures the reconnection interval of the TCP client after the module has disconnected
from a TCP server. Default value is 0 for reconnecting immediately.
NETBIOS (NetBIOS)
Command format Parameters Usage
AT+NETBIOS? Nil Read
AT+NETBIOS=<parameter> 0: Disable (Default)
1: Enable
Set
Response [NETBIOS] Value is:<value>\r\nOK\r\n
Example Command: AT+NETBIOS=1\r\n
Response: [NETBIOS] Value is:1\r\nOK\r\n
User can enter the URL http://[Module name] in the browser in the same LAN with the W5500S2E if this
command is enable.
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6.5.3 Serial settings command
COM1 (Serial parameters)
Command format Parameters Usage
AT+COM1? Nil Read
AT+COM1=<par1>,
<par2>, <par3>,
<par4>, <par5>
<par1>: Baud rate, refer to “C1_BAUD” command
<par2>: Data bit, refer to “C1_DATAB” command
<par3>: Parity bit, refer to “C1_PARITY” command
<par4>: Stop bit, refer to “C1_STOPB” command
<par5>: Serial flow control, refer to “C1_SER_C”command
Set
Response
Description
[COM1] Value is:<value1><value2><value3><value4><value5>\r\nOK\r\n
<value1>：Baud rate value
<value2>：Data bit value
<value3>：Parity bit value
<value4>：Stop bit value
<value5>：Serial flow control value
Example Command: AT+COM1=9,1,0,1,0\r\n
Response: [COM1] Value is:9,1,0,1,0\r\nOK\r\n
This command is use for set all five parameter of the serial port using single command.
Individual parameter can be also use the corresponding command for read or set.
C1_BAUD (Baud Rate)
Command format Parameters Usage
AT+C1_BAUD? Nil Read
AT+C1_BAUD=<parameter>
0: 1,200
1: 2,400
2: 4,800
3: 9,600
4: 14,400
5: 19,200
6: 38,400
7: 56,000
8: 57,600
9: 115,200
10: 128,000
11: 234,000
12: 256,000
13: 468,400
14: 921,600
(default)
15: 115,200
Set
Response [C1_BAUD] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_BAUD=9\r\n
Response: [C1_BAUD] Value is:9\r\nOK\r\n
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C1_DATAB (Data bit)
Command format Parameters Usage
AT+C1_DATAB? Nil Read
AT+C1_DATAB=<parameter>
0: 7 bit
1: 8 bit (Default)
Set
Response [C1_DATAB] Value is:<value>\r\nOK\r\n
Example Command: AT+DATAB=1\r\n
Response: [C1_DATAB] Value is:1\r\nOK\r\n
C1_STOPB (Stop bit)
Command format Parameters Usage
AT+C1_STOPB? Nil Read
AT+C1_STOPB=<parameter>
0: 0.5
1: 1 (default)
2: 1.5
3: 2
Set
Response [C1_STOPB] Value is:<value>\r\nOK\r\n
Example Command: AT+STOPB=1\r\n
Response: [C1_STOPB] Value is:1\r\nOK\r\n
C1_PARITY (Parity bit)
Command format Parameters Usage
AT+C1_PARITY? Nil Read
AT+C1_PARITY=<parameter>
0: Disable (Default)
1: Odd
2: Even
Set
Response [C1_PARITY] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_PARITY=0\r\n
Response: [C1_PARITY] Value is:0\r\nOK\r\n
C1_SER_C (Serial flow control / RS-485 enable output)
Command format Parameters Usage
AT+C1_SER_C? Nil Read
AT+C1_SER_C=<parameter>
0: Disable flow control (default)
1: Enable serial CTS/RTS hardware flow control
2: Enable 485EN pin
Set
Response [C1_SER_C] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_SER_C=1\r\n
Response: [C1_SER_C] Value is:1\r\nOK\r\n
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This command with parameter equal 1 enables the hardware serial flow control. This may improve the
data accuracy for high speed transmission.
Note: This command with parameter equals 2 will enable the 485EN pin. The RTS pin becomes RS-485
enable output for connecting external 485 chips. 485EN pin is supported by firmware version 2.3 and
above.
C1_BUF_CLS (Clear Buffer if Connected)
Command format Parameters Usage
AT+C1_BUF_CLS? Nil Read
AT+C1_BUF_CLS=<parameter> 0: Disable (default)
1: Enable
Set
Response [C1_BUF_CLS] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_BUF_CLS=1\r\n
Response: [C1_BUF_CLS] Value is:1\r\nOK\r\n
This command is valid only in TCP modes & “data pass-through mode”.
Data may be left in the serial buffer in case of disconnection. Enable this command clears the buffer
when establishing TCP connection.
C1_SER_LEN (Serial packaging Length)
Command format Parameters Usage
AT+C1_SER_LEN? Nil Read
AT+C1_SER_LEN=<parameter> Value range: 0~2048 byte
Default: 0 (Disable data packing)
Set
Response [C1_SER_LEN] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_SER_LEN=10\r\n
Response: [C1_SER_LEN] Value is:10\r\nOK\r\n
This command is valid only in “data pass-through mode”.
C1_SER_T (Serial data packing Nagle wait time)
Command format Parameters Usage
AT+C1_SER_T? Nil Read
AT+C1_SER_T=<parameter> Value range: 0~60000, unit: ms;
Default: 0
Set
Response [C1_SER_T] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_SER_T=1000\r\n
Response: [C1_SER_T] Value is:1000\r\nOK\r\n
This command is valid only in “data pass-through mode”.
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C1_IT (Inactivity timeout)
Command format Parameters Usage
AT+C1_IT? Nil Read
AT+C1_IT=<parameter> Value range: 0 ~ 60000, unit: ms;
Default: 0 (disable this function)
Set
Response [C1_IT] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_IT=1000\r\n
Response: [C1_IT] Value is:1000\r\nOK\r\n
This command is valid only in TCP modes & “data pass-through mode”.
Define the inactivity timeout period for TCP established sessions in mini seconds (ms).
C1_TCPAT (TCP keepalive interval)
Command format Parameters Usage
AT+C1_TCPAT? Nil Read
AT+C1_TCPAT=<parameter> Value range: 0~255, unit 5s;
Default: 0 (Disable)
Set
Response [C1_TCPAT] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_TCPAT=1\r\n
Response: [C1_TCPAT] Value is:1\r\nOK\r\n
This command is valid only in TCP modes & “data pass-through mode”.
This parameter determines the interval between TCP keep-alive retransmissions until a response is
received. Once a response is received, the delay until the next keep-alive transmission is again controlled
by the value.
C1_LINK_P (TCP password authentication)
Command format Parameters Usage
AT+C1_LINK_P? Nil Read
AT+C1_LINK_P=<parameter> 0: Disable (Default)
1: Enable
Set
Response [C1_LINK_P] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_LINK_P=1\r\n
Response: [C1_LINK_P] Value is:1\r\nOK\r\n
This command is valid only in TCP server mode & “data pass-through mode”.
When TCP password authentication is enabled, the module requires password input by the first packet
from the Ethernet port. If the password is wrong, it requires re-entering password until it receives a
correct password. Module password could be configured or query by the “PASS” command.
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C1_LINK_T (Connection Condition)
Command format Parameters Usage
AT+C1_LINK_T? Nil Read
AT+C1_LINK_T=<parameter> 0: Connect when power on (default)
1: Connect when receiving data from serial
Set
Response [C1_LINK_T] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_LINK_T=1\r\n
Response: [C1_LINK_T] Value is:1\r\nOK\r\n
This command is valid only in TCP client mode & “data pass-through mode”.
This is the timing for the module connecting to the TCP server. If it is 0, it will connect when power on.
If it is 1, the module will establish the connection establishment when receiving the first package of data
from the serial interface. When connection established, the data will be sent to the TCP server and
module would be in data pass-through mode.
C1_LINK_M (Send Hello Message)
Command format Parameters Usage
AT+C1_LINK_M? Nil Read
AT+C1_LINK_M=<parameter>
0: Disable (Default)
1: Send Device ID
2: Send MAC address
3: Send IP address
Set
Response [C1_LINK_M] Value is:<value>\r\nOK\r\n
Example Command: AT+C1_LINK_M=1\r\n
Response: [C1_LINK_M] Value is:1\r\nOK\r\n
This command is valid only in TCP client mode for both “data pass-through mode” & “AT data transfer
command mode”. It will determine the first message to be sent right after connection established.
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6.5.4 Management command
C1_SEND_NUM (Serial sent number of byte)
Command format Parameters Usage
AT+C1_SEND_NUM? Nil Read
Response [C1_SEND_NUM] Value is:<value>\r\nOK\r\n
Display range: 0 ~ 4,294,967,295。
Example Command: AT+C1_SEND_NUM?\r\n
Response: [C1_SEND_NUM] Value is:2048\r\nOK\r\n
This command is valid for both “data pass-through mode” & “AT data transfer command mode”.
C1_RCV_NUM (Serial received number of byte)
Command format Parameters Usage
AT+C1_RCV_NUM? Nil Read
Response
Description
[C1_RCV_NUM] Value is:<value>\r\nOK\r\n
Display range: 0 ~ 4,294,967,295。
Example Command: AT+C1_RCV_NUM?\r\n
Response: [C1_RCV_NUM] Value is:2048\r\nOK\r\n
This command is valid for both “data pass-through mode” & “AT data transfer command mode”.
NETSEND (Network sent byte)
Command format Parameters Usage
AT+NETSEND? Nil Read
Response [NETSEND] Value is:<value>\r\nOK\r\n
Display range: 0 ~ 4,294,967,295。
Example Command: AT+NETSEND?\r\n
Response: [NETSEND] Value is:2048\r\nOK\r\n
This command is valid for both “data pass-through mode” & “AT data transfer command mode”.
NETRCV (Network received byte)
Command format Parameters Usage
AT+NETRCV? Nil Read
Response
Description
[NETRCV] Value is:<value>\r\nOK\r\n
Display range: 0 ~ 4,294,967,295。
Example Command: AT+NETRCV?\r\n
Response: [NETRCV] Value is:2048\r\nOK\r\n
This command is valid for both “data pass-through mode” & “AT data transfer command mode”.
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PRE (List preset values)
Command format Parameters Usage
AT+PRE? Nil Read
Response
DEFAULT:
[NAME] :W5500S2E-S1
[PASS] :admin
[DOMAIN] :www.iwiznet.cn
[IP] :192.168.1.88
[MARK] :255.255.255.0
[GATEWAY] :192.168.1.1
[DNS] :114.114.114.114
[WEB_PORT] :80
[C1_PORT] :5000
[C1_BAUD] :9
[C1_DATAB] :1
[C1_PARITY] :0
[C1_STOPB] :1
[C1_SER_C] :0
[C1_SER_T] :0
[C1_SER_LEN]:0
[C1_CLI_IP1]:192.168.1.99
[C1_CLI_PP1]:5000
CURRENT:
[NAME] :W5500S2E-S1
[PASS] :admin
[DOMAIN] :www.iwiznet.cn
[IP] :192.168.1.88
[MARK] :255.255.255.0
[GATEWAY] :192.168.1.1
[DNS] :114.114.114.114
[WEB_PORT] :80
[C1_PORT] :5000
[C1_BAUD] :9
[C1_DATAB] :1
[C1_PARITY] :0
[C1_STOPB] :1
[C1_SER_C] :0
[C1_SER_T] :0
[C1_SER_LEN]:0
[C1_CLI_IP1]:192.168.1.99
[C1_CLI_PP1]:5000
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OK
LIST (List all commands)
Command format Parameters Usage
AT+LIST? Nil Read
Response
[Control Command]
AT AT+ECHO AT+DEBUGMSGEN
AT+NAME AT+PASS AT+DEFAULT
AT+RESET AT+EXIT AT+SAVE
[Module Settings Command]
AT+START_MODE AT+C1_OP AT+IP_MODE
AT+IP AT+MARK AT+GATEWAY
AT+DNS AT+C1_PORT AT+C1_BIND
AT+DNSEN AT+C1_CLI_IP1 AT+C1_CLI_PP1
AT+DOMAIN AT+RECONTIME AT+NETBIOS
[Serial Settings Command]
AT+COM1 AT+C1_BAUD AT+C1_DATAB
AT+C1_STOPB AT+C1_PARITY AT+C1_SER_C
AT+C1_BUF_CLS AT+C1_SER_LEN AT+C1_SER_T
AT+C1_IT AT+C1_TCPAT AT+C1_LINK_P
AT+C1_LINK_T AT+C1_LINK_M
[Management Command]
AT+C1_SEND_NUM AT+C1_RCV_NUM AT+NETSEND
AT+NETRCV AT+PRE AT+LIST
AT+RUNTIME AT+VER AT+MAC
AT+SN AT+TYPE AT+WEB_PORT
[Data Transfer Command]
AT+LINK AT+LISTEN AT+CONNECT
AT+TCP_STATUS AT+UDP AT+SEND
AT+RLEN AT+RCV AT+CLEAR
AT+DISCON
OK
RUNTIME (Module uptime)
Command format Parameters Usage
AT+RUNTIME? Nil Read
Response
Description
[RUNTIME] Value is:<value>\r\nOK\r\n
Format: ddd-hh-mm-ss
Display range: 000-00-00-00 ~ 999-23-59-59。
Example Command: AT+RUNTIME?\r\n
Response: [RUNTIME] Value is:003-15-38-42\r\nOK\r\n
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VER (Firmware version)
Command format Parameters Usage
AT+VER? Nil Read
Response [VER] Value is:<value>\r\nOK\r\n
Example Command: AT+VER?\r\n
Response: [VER] Value is:V2.3\r\nOK\r\n
MAC (MAC address)
Command format Parameters Usage
AT+MAC? Nil Read
Response [MAC] Value is:<value>\r\nOK\r\n
Example Command: AT+MAC?\r\n
Response: [MAC] Value is:00.08.DC.11.12.13\r\nOK\r\n
SN (Serial Number)
Command format Parameters Usage
AT+SN? Nil Read
Response [SN] Value is:<value>\r\nOK\r\n
Example Command: AT+SN?\r\n
Response: [SN] Value is:20190102-111213\r\nOK\r\n
TYPE (Module part number)
Command format Parameters Usage
AT+TYPE? Nil Read
Response [TYPE] Value is:<value>\r\nOK\r\n
Example Command: AT+TYPE?\r\n
Response: [TYPE] Value is:W5500S2E-Z1\r\nOK\r\n
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WEB_PORT (Web configuration port number)
Command format Parameters Usage
AT+WEB_PORT? Nil Read
AT+WEB_PORT=<parameter> Range: 1 ~ 65,535, Default: 80。 Set
Response [WEB_PORT] Value is:<value>\r\nOK\r\n
Example Command: AT+WEB_PORT=80\r\n
Response: [WEB_PORT] Value is:80\r\nOK\r\n
This port number is used for configuration through web browser. The value range is 0 to 65535. If the
port wasn’t set to 80, the port number should be added to the end of the IP address. For example:
http://192.168.1.88:8080 if port is 8080
Note: If the module is in TCP server mode, the web configuration port must be the difference to the
local port number (C1_PORT).
6.6 AT Data transfer command
LINK (Detect PHY link status)
Command format Parameters Usage
AT+LINK? Nil Read
Response
Description
[LINK] Value is:<value>\r\nOK\r\n
0: no PHY link
1: has PHY link
Example Command: AT+LINK?\r\n
Response: [LINK] Value is:1\r\nOK)\r\n
Note: This command is supported by firmware version 2.3 and above.
LISTEN (Listening on TCP)
Command format Parameters Usage
AT+LISTEN Nil Execute
Response
Description
OK\r\n
Upon successful completion
Response
Description
<Error Info>\r\n
Module is not in TCP server mode
Example Command: AT+LISTEN\r\n
Response: OK\r\n
This command is valid only in TCP server mode. i.e. “C1_OP” is set as “0”. Otherwise, it will respond with
error message. It can be closed by the command “DISCON”.
Note: After execute this command, TCP connection can be monitor with the “TCP_STATUS” command or
the voltage level of the “TCP_STATUS” pin.
This command is supported by firmware version 2.3 and above.
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CONNECT (Initiating TCP connection)
Command format Parameters Usage
AT+CONNECT Nil Execute
Response
Description
OK\r\n
Upon successful completions
Response
Description
<Error Info>\r\n
Module is not in TCP client mode
Example Command: AT+CONNECT\r\n
Response: OK\r\n
This command is valid only in TCP client mode. i.e. “C1_OP” is set as “1”. Otherwise, it will respond with
error message. After execute this command; the module will try to connect to the TCP server. If
connection cannot be established in 3s, it returns with error messages.
Note: After execute this command, TCP connection can be monitor with the “TCP_STATUS” command or
the voltage level of the “TCP_STATUS” pin. This command is supported by firmware version 2.3 and
above.
TCP_STATUS (TCP connection status)
Command format Parameters Usage
AT+TCP_STATUS Nil Read
Response
Description
[TCP_STATUS ] Value is:<value>\r\n OK\r\n
0: TCP not connected
1: TCP connected
Example Command: AT+TCP_STATUS?\r\n
[TCP_STATUS ] Value is:1\r\n OK\r\n
This command is valid only in TCP modes.
This command and the “TCP_STATUS” pin can both be used to monitor the TCP connection status.
Note: This command is supported by firmware version 2.3 and above.
UDP (Establish UDP connection)
Command format Parameters Usage
AT+UDP Nil Execute
Response
Description
OK\r\n
Upon successful completions
Response
Description
<Error Info>\r\n
Module is not in TCP client mode
Example Command: AT+UDP\r\n
Response: OK\r\n
This command is valid only in UDP mode i.e. “C1_OP” is set as “2”. Otherwise, it will return with error.
Note: This command is supported by firmware version 2.3 and above.
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SEND (Send byte of data)
Command format Parameters Usage
AT+SEND=<parameter> Range: 0~2048 (bytes), Default: 0 (any length) Set
Response
Description
[SEND] Value is:<value>\r\nOK\r\n
Set the length of data to be sent
Example
Assume module is in TCP mode and TCP connection is connected
Command: AT+TCP_STATUS?\r\n
[TCP_STATUS ] Value is:1\r\n OK\r\n
Command: AT+SEND=5\r\n
Response: [SEND] Value is:5\r\nOK\r\n
Then send data via serial: 12345
Response: 5
Example
Assume module is in TCP mode and TCP connection is not connected
Command: AT+TCP_STATUS?\r\n
[TCP_STATUS ] Value is:0\r\n OK\r\n
Command: AT+SEND=5\r\n
Response: [SEND] Value is:5\r\nOK\r\n
Then send data via serial: 12345
Response: 0
① If the module is in TCP modes, it is need to check the TCP connection status before using this
command. Reference to “TCP_STATUS” for details.
② If this command execute successfully, the serial port will get the response value. The next input
send to the serial port will be regarded as data and send out. Then, the module will be gone back
to AT command mode.
③ If the set value is zero, input from the serial port will be packaged by 50ms frame interval. After
the first byte sent from the serial port, the data will be sent whenever there is idle time longer than
50ms. Any extra data after 2,048byte will be discarded.
④ If the set value is non-zero, the module will wait for receiving data with length of the set value. Any
extra data will be discarded.
⑤ If data sent successfully, the module will respond with the sent data length.
Note: This command is supported by firmware version 2.3 and above.
RLEN (Receive buffer data Length)
Command format Parameters Usage
AT+RLEN? Nil Read
Response
Description
[RLEN] Value is:<value>\r\nOK\r\n
Range: 0 ~ 2048。
Example
Data in buffer to be received: abcdef
Command: AT+RLEN?\r\n
Response: [RLEN] Value is:6\r\nOK\r\n
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This command reads the data in the network receiving buffer (with length in bytes).
Note: This command is supported by firmware version 2.3 and above.
RCV (Receive data)
Command format Parameters Usage
AT+RCV=<parameter> Range: 0 ~ 2048, Default: 0 (Whatever length)。 Set and execute
Response [RCV] Value is:<value>\r\nOK\r\n
Example
Length of data in buffer to be received: abcdef
Command: AT+RCV=0\r\n
Response: [RCV] Value is:0\r\nOK\r\n
Response: abcdef
① If module is in TCP modes, Receiving rules: If the module is in TCP modes, it is need to check the
TCP connection status before using this command. Reference to “TCP_STATUS” for details.
② If this command executed successfully, the serial port will send out the data from the network
receiving buffer. Then, the module will be gone back to AT command mode.
③ If the data in the network buffer has length equal to 2,048bytes, module will not receive further
data.
④ If the data in the network buffer is less than the received length here, data will not be received and
it should respond value 0.
Note: This command is supported by firmware version 2.3 and above.
CLEAR (Clear the network receiving buffer)
Command format Parameters Usage
AT+CLEAR Nil Execute
Response OK\r\n
Example Command: AT+CLEAR\r\n
Response: OK\r\n
This command clears the data in the network receiving buffer.
Note: This command is supported by firmware version 2.3 and above.
DISCON (Disconnect)
Command format Parameters Usage
AT+DISCON Nil Execute
Response OK\r\n
Example Command: AT+DISCON\r\n
Response: OK\r\n
This command closes the socket opened in TCP server, TCP client and UDP modes.
Note: This command is supported by firmware version 2.3 and above.
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6.7 AT command script examples
6.7.1 TCP server mode script example
AT\r\n
OK\r\n
AT+DEBUGMSGEN=0\r\n
[DEBUGMSGEN] Value is:0\r\nOK\r\n
AT+ECHO=0\r\n
[ECHO] Value is:0\r\nOK\r\n
AT+START_MODE=1\r\n
[START_MODE] Value is:1\r\nOK\r\n
AT+C1_OP=0 \r\n
[C1_OP] Value is:0\r\nOK\r\n
AT+IP_MODE=0\r\n
[IP_MODE] Value is:0\r\nOK\r\n
AT+IP=192.168.1.88\r\n
[IP] Value is:192.168.1.88\r\nOK\r\n
AT+C1_PORT=5000\r\n
[C1_PORT] Value is:5000\r\nOK\r\n
AT+RESET=admin\r\n
OK\r\n
//Terminal check
//Disable debug message
//Echo on
//Configure start mode into “Data pass-through mode”
//Configure into TCP server mode
//Set into static IP mode
//Set local IP address
//Set the local port number
//Save the setting, restart in enter data pass-through mode
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6.7.2 TCP client AT command mode script example
AT\r\n
OK\r\n
AT+DEBUGMSGEN=0\r\n
[DEBUGMSGEN] Value is:0\r\nOK\r\n
AT+ECHO=0\r\n
[ECHO] Value is:0\r\nOK\r\n
AT+START_MODE=0\r\n
[START_MODE] Value is:0\r\nOK\r\n
AT+C1_OP=1\r\n
[C1_OP] Value is:1\r\nOK\r\n
AT+IP_MODE=1\r\n
[IP_MODE] Value is:1\r\nOK\r\n
AT+DNSEN=0\r\n
[DNSEN] Value is:0\r\nOK\r\n
AT+C1_CLI_IP1=192.168.1.99\r\n
[C1_CLI_IP1] Value is:192.168.1.99\r\nOK\r\n
AT+C1_CLI_PP1=5000\r\n
[C1_CLI_PP1] Value is:5000\r\nOK\r\n
AT+SAVE\r\n
OK\r\n
AT+CONNECT\r\ n
OK\r\n
AT+TCP_STATUS?\r\n
[TCP_STATUS] Value is:1\r\nOK\r\n
AT+SEND=5\r\n
OK\r\n
//Terminal check
//Turn off the serial debugging message
//Echo off
//Configure start mode to “AT command mode”
//Configure as TCP client mode
//Configure the module to DHCP mode
//Disable DNS function
//Configure remote TCP server IP address
//Configure remote TCP server port number
//Save configuration and restart
//Initiate a connection request to the remote TCP server
//Read the TCP connection status
//Notification module will send 5 bytes of data
Serial sends data:12345
Serial receives:5
TCP server sends data: abcdef
AT+RLEN?\r\n
[RLEN] Value is:6\r\nOK\r\n
AT+RCV=3\r\n
[RCV] Value is:3\r\nOK\r\n
//Read data length in the receiving buffer.
//Receive 3 bytes of data
abc
AT+CLEAR\r\n
OK\r\n
AT+DISCON\r\n
OK\r\n
//Clear network receiving buffer
//Close TCP connection
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7 Web configuration
You log into your WIZS2E's firmware through a browser. It is recommended using Chrome.
7.1 Login page
At the address field of the browser, type the IP address of your module. The default IP address
of WIZS2E module is 192.168.1.88. You may first search for your module IP by the ConfigTool
software. Figure below shows the login page.
Figure 7-1 Login page
The default password is “admin”.
This page shows the basic information of the W5500S2E module.
Figure 7-2 Device View page
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7.2 Basic Settings
Figure below shows W5500S2E basic settings page. It separates into four sections.
On each screen, you may need to click “Save Settings” before you move onto the next screen.
After you've done that, you may click “Reset” to reset the module for the settings to be
applied.
Please know that the session time for the W5500S2E webserver is 5 minutes. After 5 minutes
of inactivity, re-login is required.
Figure 7-3 Basic Settings page
Network Setting
Setting Description Default
MAC Address MAC address of the module Not configurable
Use DHCP DHCP mode option Disable (uncheck)
IP address IP address of the module 192.168.1.88
Subnet Mask Subnet Mask 255.255.255.0
Gateway Gateway 192.168.1.1
DNS Server DNS server IP address 114.114.114.114
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Socket Setting
Setting Description Default
Start mode “AT Command Mode” or “Data pass-through mode” “AT Command Mode”
Socket Type “TCP Server”, “TCP Client” or “UDP mode” “TCP Server”
Remote Host Remote host IP address or domain name 192.168.1.99
Remote Port Remote host port number 5000
Local Port Local port number (0~65535; avoid used port) 5000
Bind Local Port Only valid in TCP client mode Disable (uncheck)
Modbus option
Setting Description Default
Enable Modbus Mode Enable Modbus Mode function Disable
Select Modbus Mode “Modbus RTU” or “Modbus ASCII” “Modbus RTU”
UART Setting
Setting Description Default
Baud Rate 1200bps ~ 1,152,000bps 115,200
Data Bit 7 or 8 bits 8
Parity NONE, ODD or EVEN NONE
Stop Bit 1 or 2 bits 1
Flow Control NONE or “CTS/RTS mode” NONE
Save Settings: Click to save all these settings
Reset: Click to Restart (Need to click “Save Settings” to apply the setting)
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7.3 Advance Options
Figure below shows the advance settings page of WIZS2E module.
Figure 7-4 Advance Options page
Device Name: The module name, the user could make its own definition, it could be any
characters. Maximum 15 bytes
Enable NETBIOS: Check this box to activate this feature, default: disable; if activated,
the user could type the device name (case insensitive) in the browser to login to the
webserver of this module.
HTTP Port: W5500S2E’s web server port number, default: 80; value range is 0 to 65535.
If the port wasn’t set to 80, then need to input the port at the end of the IP address. For
example: 192.168.1.88:8000.
Note: If W5500S2E works in TCP server mode, HTTP port must not be set to the same as
the local port of the module.
Data Packing Size (byte): Data packaging length, default: 0 (disable), maximum size
is 2048 bytes.
Data Packing Time (ms): Waiting interval of data packet, default: 0 (disable),
maximum value is 60,000.
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Reconnection Time (ms): reconnection interval, only effective in TCP client mode,
default: 0 (instant reconnection), value range: 0 to 60000, unit: ms
Inactivity Time (ms): Set the Inactivity timeout, only effective in TCP modes, value
range: 0 ~ 60000, unit: ms, default: 0 (disable)
Keep Alive Time (5s): Set the Keep alive timer, only effective in TCP modes, value
range: 0 ~ 65536, unit: 5s; default: 0 (disable)
Verify the Connection: When the user created a communication in TCP and this
command was enabled, the module requires a password confirmation from the Ethernet
side. If the password is wrong, it requires re-entering password until it receives a correct
password. Default: No (disable)
Send Hello Message: Define message sent when TCP connection succeeds. Selections
includes: “None”, “Send Device Name”, “Send MAC Address” or “Send IP Address”.
Default: “None” (disable)
Connection Condition: In TCP client mode, this function can set as “Connect socket
after power up” (default) or “Connect socket after UART received data”
Clear Buffer if Connect: Data may be left in the serial buffer in case of disconnection.
Enable this command clears the buffer when establishing TCP connection. Default:
uncheck (disable)
Debug Message Enable: This will enable debug message sending to the serial interface.
Thus, this option may help users more easily through serial terminal software manually.
Default: checked (enable)
AT Echo Enable: Echo means WIZS2E module could directly return the input values to
the serial interface. Thus, this option may help some users working more easily through
serial terminal software. However, this may cause trouble if the serial is connected to an
embedded system. Turning off this function may help. Default: checked (enable)
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7.4 Management
Clicking “Management” to get into device management page as figure below, this page
contains 2 sections: Password Settings and Management
Figure 7-5 Management page
Password Setting
 Old Password - the old password, default: admin
 New Password - Enter new password. Maximum for 15 bytes. It must be numbers,
alphabets or the combination of both. It does not accept blank as input value.
 Confirm Password - Re-enter the new password
 Set - Submit button for renewing password
Management
 Factory Default - factory reset button, pressing this button will activate factory reset
procedure. It shows a prompt window for re-confirmation is procedure, please click
“OK” for factory reset procedure and back to login page.
 Reset Device - Reset the module
 Logout – Logout back to the login page
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8 Factory reset
If you forget the password of the module, the user could reset all setting of the module
back to factory default. There are three kinds of method to factory reset:
8.1 By ConfigTool
In the WIZS2E ConfigTool, first select the module which you need
to factory reset.
Please click “Reset” button and then click “Factory Reset” button to
factory reset the module back to default settings.
8.2 By using AT command
For details of AT command (default) to factory reset, please refer to the command
“DEFAULT” in chapter 6.5.1.
8.3 By hardware
Factory reset through evaluation board
Press the DEFAULT button for more than 3 seconds for factory reset.
Factory reset through module pin
W5500S2E-S1 W5500S2E-Z1 W5500S2E-R1
Figure 8-1 through the module default PIN to restore factory settings
W5500S2E has a factory reset PIN. Pull down the DEFAULT pin for over 3 seconds to
activate factory reset when the module is power on.
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9 Firmware upgrade
9.1 Firmware upgrade by WIZS2E ConfigTool
Please make sure the IP address of the module needs to be in the same subnet with the
host computer. Then perform the steps below:
a. Click “Search”
b. Click the designated module
c. Click “Upload Firmware” button
d. Choose the related firmware bin file
Figure 9-1 WIZS2E firmware upgrade through ConfigTool
The following popup will show up after firmware upgrade successes.
Figure 9-2 ConfigTool popup after firmware upgrade
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9.2 Firmware upgrade by web page
After logon to the web page and entered the “Firmware” tag. Click “Choose file” as shown
below.
Figure 9-3 Firmware upgrade by web page
After firmware uploaded, W5500S2E will reboot automatically for firmware updating. It
will be auto reload to the login page after that.
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W5500S2E serial to Ethernet module
Disclaimers
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W5500S2E user manual
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