Blog

Product Overview

1.1 product introduction

The RS232/485/422-ETH module is a composite serial server, which not only has the function of a conventional serial server, but also converts the standard RS-232/422/485 serial signal into TCP/IP signal, realize the two-way data transparent transmission between RS-232/422/485 serial port and TCP/IP network interface. At the same time, it has the function of Modbus Gateway, realizes the conversion between Modbus CP and Modbus RTU, makes the serial port equipment have the function of TCP/IP network interface, connects local area network for data communication, greatly reduces the wiring engineering of serial port equipment, and is easy to maintain, and extend communication patterns and distances.

1.2 features

• Modbus TCP to Modbus RTU, realizing the communication between Ethernet Modbus TCP Master Station Equipment and serial Port Modbus RTU slave station equipment.
• Modbus RTU to Modbus TCP, realizing the communication between the Serial Port Modbus RTU master station equipment and Ethernet Modbus slave station equipment.
• Web configuration parameters, convenient and fast; web configuration of different slave properties, modified 485 communication parameters and network parameters
• Independent TCP to RS485 transmission; communication parameters can be set through the web page; module as a server.
• Independent TCP to RS232 transmission; communication parameters can be set through the web page; module as a server.
• Independent TCP to RS422 transmission; communication parameters can be set through the web page; module as a server.

1.3 application scenarios

RS232/485/422-ETH can be widely used in industrial automation, PLC control, building automation, POS system, power monitoring, access control medical, attendance system, self-service banking system, Telecom Equipment Room Monitoring, information appliances, LED information display equipment, measuring instruments and environmental power monitoring system, etc. RS232/422/485 serial port equipment or systems.

Product parameters

COM1(RS485 communication parameter)

Support function	Modbus RTU to Modbus TCP Modbus TCP to Modbus RTU 485 mouth and net mouth transmission
Interface type	RS485, Stud Terminal
Baud rate	9600 ~ 115200(default baud rate 9600)
Communication format	Modbus RTU; 8-bit data, 1-bit stop, no check (configurable)
Transmission distance	1,200 meters

COM2(RS422 communication parameter)

Support function	TCP to RS422 transmission
Interface type	RS485, Stud Terminal
Baud rate	9600 ~ 115200(default baud rate 9600)
Communication format	Default: 8-bit data, 1-bit stop, no check (configurable)
Transmission distance	1,200 meters. Baud rate 9600

COM3(RS232 communication parameter)

Support function	TCP to RS232 transmission
Interface type	RS232, DB9 terminal header
Baud rate	9600 ~ 115200(default baud rate 9600)
Communication format	Modbus RTU; 8-bit data, 1-bit stop, no check (configurable)

Ethernet interface parameters

Interface form	RJ45
Communication Protocol	Modbus TCP; TCP; HTTP;
Rate	10 mbps; full duplex

Modbus TCP parameters

Default IP	192.168.1.15
Default port	502

Power parameter

Operating voltage	DC 9V ~ 24V; with protection against reverse connection
Power consumption	0.5 W ~ 2W

Working Environment

Operating temperature	20 °C ~ + 70 °C
Storage temperature	40 °C ~ + 85 °C

In the news

Installation Mode	Guide rail
Dimensions	96 * 60 * 25(L * W * H overall size)

Product specification

3.1 Installation dimensions

3.2 interface specification

3.2.1 terminal definition

Function	Name	Instruction
Power supply	VCC	24V DC power supply Positive
	GND	24V DC power supply Negative
RS422	R +	Module RXD + (RS422) , connected to 422 communication device TXD +
	R –	Module RXD-(RS422) , connect 422 communication equipment txd –
	T +	Module TXD + (RS422) , connected to 422 communication device RXD +
	T-minus	Module txd-(RS422) , connect 422 communication equipment RXD-
RS485	A	A (RS485)
	B	B (RS485)

3.2.2 RS232C interface description

Pin sequence	PIN action	Pin name
1	Data carrier detection	DCD
2	(module) data reception	Rxd
3	(module) data transmission	TXD
4	Data terminal preparation	DTR
5	GND	GND
6	Data Equipment Preparation	DSR
7	Request send	RTS
8	Clear send	CTS
9	Ringing’s instructions	Ri

3.2.3 Light instructions

Name	Function	Instruction
PWR	Power Indicator	The green light is always on, indicating that the power supply is normal
SYS	System light	● Flash Mob: Network interface and 485 data normal exchange ● One second on, one second off Establish connection no data interaction ● One flash per second: 485 communication anomaly, no slave data set ● Long time on: Idle State, no 485 communication, no Modbus TCP Make the connection ● Out in 5 seconds: Resetting
232	232, Comms Light	● Flicker: Establish TCP connection under the serial port or network port has data transceiver ● Long time on: Just establish a TCP connection with no data interaction ● Put Out: No data interaction, no TCP connection established
422	422, Comms Light	● Flicker: Establish TCP connection under the serial port or network port has data transceiver ● Long time on: Just establish a TCP connection with no data interaction ● Put Out: No data interaction, no TCP connection established
485	485 communication light	● Flicker: Establish TCP connection under the serial port or network port has data transceiver ● Long time on: Just establish a TCP connection with no data interaction ● Put Out: No data interaction, no TCP connection established

3.2.4 reset function

After normal power, long press the reset button for 5 seconds, and release in 2 seconds, Sys indicator lights off for 5 seconds to restore normal light means successful reset, and then power off restart module. After the Reset, the system parameters are restored to the default state, as explained below:
✓The serial port parameters of RS485/232/422 are 9600,8, NONE, 1; the TCP communication mode of RS485 is Server
✓ This machine is IP 192.168.1.15, subnet mask 255.255.255.0, Gateway 192.168.1.1
✓ The remote host IP is 192.168.1.124, and the remote host IP port number is 8080
✓ Web login password is 123456

4. Quick start

This chapter is a quick introduction to the RS232/485/422-ETH module. Users will have a systematic understanding of this module after learning the contents of this chapter. Please refer to other chapters for more details.

4.1 How to connect

4.1.1

The power supply of the module uses screw terminals. First, select the correct DC power supply whose working voltage and current are in accordance with the electrical parameters of the module. Then connect the positive and negative poles of the power supply to the + and-terminals of the module respectively, pay attention to the positive and negative power supply, do not connect the reverse. The module power supply has the function of anti-reverse connection to prevent the damage of the module caused by the positive and negative pole of the reverse connection power supply.

4.1.2 serial connection

There are three kinds of RS485/232/422 serial port signals in the module, among which RS232 adopts DB9 header, RS485/422 adopts screw terminal, and the connection is made according to the interface instruction in chapter 3.2. Attention should be paid to the data transmission and reception between the module and the equipment. When RS485 is connected to Modbus RTU slave station equipment, the bus form of hand-in-hand should be adopted.

4.1.3 internet connection

The RJ45 bus is used for the module network interface. The user needs to connect the Ethernet device with 10MBPS network cable (through the switch/router) . Today’s Ethernet devices basically support Ethernet port automatic jumper, you can directly use the network cable and Ethernet device connection.

If the Ethernet device connected to this module does not support automatic polarity switching, you will need to use cross wires, which are made as follows:

I. The T568A standard describes the order of lines from left to right:

1-green white (the outer layer of green has some white, which is the same group of lines as green)
2.-green
3-orange white (orange with some white on the outer layer, the same set of lines as orange)
4-.-blue
5–bluish white (blue with some white on the outer layer, the same set of lines as blue)
6-.-orange
7–brownish-white (the outer layer of brown has some white, which is the same set of lines as Brown)
8-.-brown

II. The T568B standard describes the order of lines from left to right:

1–orange white (orange with some white on the outer layer, the same set of lines as orange)
2–orange
3–green white (green with some white on the outer layer, and green is the same group of lines)
4–blue
5–bluish white (blue with some white on the outer layer, the same set of lines as blue)
6–green
7–brownish-white (the outer layer of brown has some white, which is the same set of lines as Brown)
8–brown

4.2 Ethernet to RS485 communication

Module RS485 supports Modbus TCP to Modbus RTU, Modbus RTU to TCP, TCP to RS485 transmission three communication modes, factory default communication mode.

Before MODUBS switch to Modbus RTU communication, the module RS485 interface should be connected to the serial port equipment RS485, and the module network interface should be connected to the Ethernet equipment through the network line (wiring reference section 4.1.2) to complete the hardware connection. Then log on to the module IP page and view or configure the module’s serial port parameters and IP (operations refer to Section 5.1.2) to ensure that the Ethernet device segment is consistent with the module and does not conflict with IP, and the communication parameters of the serial device are consistent with the module. The Modbus TCP message format is referred to in section 5.1.2.

For the other two modes of communication, it is first necessary to switch the mode through the web page configuration, and then to ensure that the device and module network parameters, serial port parameters match (refer to section 5.2.2 or section 5.6.2 for specific operations).

4.3 Ethernet to RS232/RS422 communication

This module can realize the transmission of TCP data between RS232/RS422 serial port equipment and Ethernet equipment. Before communication, the module RS232/RS422 interface should be connected with corresponding serial port equipment, and the module network interface with Ethernet equipment (connection reference section 4.1.2).

Then through the module IP page, ensure that the device and module serial port, network parameters match (specific Operation Reference Section 5.4.2 or section 5.5.2).

5.Product features

5.1 Modbus TCP to MODBUT RTU communication mode

The request of Modbus TCP is directly converted into Modbus RTU request and sent to slave station through RS485 port, then the corresponding slave station data is converted into Modbus TCP message and sent to host computer.

5.1.1 Modbus TCP to Modbus RTU communication mode parameters

Parameter type	Detail
Default module IP	192.168.1.15
Default Module Port	502
Number of supported connections	1
Native TCP Mode	Server
RS485 communication parameter	Line 2: A to the 485 bus B-minus on 485 bus Default communication parameters: Baud rate: 9600,8 bit data, no parity, 1 bit stop, web configurable

5.1.2 Modbus TCP to Modbus RTU mode configuration

Step 1: Open the web page and go to the “Parameter configuration”screen. See section 5.3, “Page configuration parameters”for details
Step 2: select the 485 parameter as “Server”, as shown in the following figure

Step 3: configure the module’s IP and gateway on demand, as shown in the following figure

Step 4: Configure Module RS485 serial port parameters according to requirement, refer to section 5.3.2 for detailed operation
Step 5: Power Off and Restart module

5.1.3 Modbus TCP message format

(1) Digital Input Signal Acquisition Command

Protocol statement

Function code: 0x02
Discrete input register 0x00-0x15 corresponds to input channel 1-16;
When the input port state is invalid, the indicator light goes out and returns to 0; when valid, the indicator light turns on and returns to 1;

Read the format description of the discrete input request message

Read discrete INPUT REQUEST -MODBUSDTCP TCP packet format)

Serial number	Message Field	Length (bytes)	Bytes, storage mode	Instruction
1	Transaction identification	2	High Byte first	It’s usually a message serial number
2	Protocol identification	2		The default is 0000
3	Message length	2	High Byte firstHigh Byte first	The data length, excluding transaction identification, protocol identification, and message length
4	Unit identification	1		Range from 0x00 ~ 0xff; local bit 0 or 1; rest for RS485 ports; from machine address
5	Function code	1	0x02	The related function code of Modbus communication protocol
6	Starting address	2	High Byte first
7	Number of registers	2	High Byte first

Read the format specification for discrete input reply messages

Read the discrete input reply (Modbus TCP message format)

Serial number	Message Field	Length (bytes)	Bytes, storage mode	Instruction
1	Transaction identification	2	High Byte first	Usually a message serial number, the same as the request message
2	Protocol identification	2	High Byte first	The default is 0000
3	Message length	2	High Byte first	The data length, excluding transaction identification, protocol identification, and message length
4	Unit identification	1		Range from 0x00 ~ 0xff; local bit 0 or 1; rest for RS485 ports; from machine address
5	Function code	1	0x02	The related function code of Modbus communication protocol
6	Data Length	1		The data length is N bytes, the data length value is n
7	ata	N	Low byte in front, high bit per byte, in front	8-bit discrete input per 1 byte

Example message description

Read out the input status of channels 1-16, only channel 7 is valid in the example
Request message:
00 06 00 00 00 06 01 02 00 00 00 10
00060000000601020000010
Reply message
00 06 00 00 00 05 01 02 02 40 00
0006000000050102024000

(2) Digital output signal acquisition command

Protocol statement

Function code: 0x01
Discrete output register 0x00-0x015 corresponds to output channel 1-16; this instruction is used to read the current coil register state.
When the output state is invalid, the indicator light goes out and returns to 0; when valid, the indicator light comes on and returns to 1;

Description of request message format for reading discrete output status

Read coil status request

Serial number	Message Field	Length (bytes)	Bytes, storage mode	Instruction
1	Transaction identification	2	High Byte first	It’s usually a message serial number
2	Protocol identification	2	High Byte first	The default is 0000
3	Message length	2	High Byte first	The data length, excluding transaction identification, protocol identification, and message length
4	Unit identification	1		Range from 0x00 ~ 0xff; local bit 0 or 1; rest for RS485 ports; from machine address
5	Function code	1	0x01	The related function code of Modbus communication protocol
6	Starting address	2	High Byte first
7	Number of registers	2	High Byte first

Description of the format of the read coil output reply message

Read coil status response

Serial number	Message Field	Length (bytes)	Bytes, storage mode	Instruction
1	Transaction identification	2	High Byte first	Usually a message serial number, the same as the request message
2	Protocol identification	2	High Byte first	The default is 0000
3	Message length	2	High Byte first	The data length, excluding transaction identification, protocol identification, and message length
4	Unit identification	1		Range from 0x00 ~ 0xff; local bit 0 or 1; rest for RS485 ports; from machine address
5	Function code	1	0x01	The related function code of Modbus communication protocol
6	Data Length	1		The data length is N bytes, the data length value is n
7	Data	N	Low byte in front, high bit per byte, in front	8-bit discrete output per 1 byte

Example message description

Read out the output status of channels 1-16. Only channels 2 and 13 are valid in the example

Request message:
00 01 00 00 00 06 01 01 00 00 00 10
Reply message
00 01 00 00 00 05 01 01 02 02 10

(3) Digital output signal single control command

Protocol statement

Function code: 0x05

Discrete output register 0x00-0x15 corresponds to output channel 1-16; this instruction is used to read the state of the current coil register.
When the output state is invalid, the indicator light goes out and returns to 0; when valid, the indicator light comes on and returns to 1;

Write a request packet format specification for a single discrete output

Write a single coil request

Serial number	Message Field	Length (bytes)	Bytes, storage mode	I1nstruction
1	Transaction identification	2	High Byte first	It’s usually a message serial number
2	Protocol identification	2	High Byte first	The default is 0000
3	Message length	2	High Byte first	The data length, excluding transaction identification, protocol identification, and message length
4	Unit identification	1		Range from 0x00 ~ 0xff; local bit 0 or 1; rest for RS485 ports; from machine address
5	Function code	1	0x05	The related function code of Modbus communication protocol
6	Write address	2	High Byte first
7	Write value	2	High Byte first	Write 0XFF00 to enable output; write 0X0000 to stop output;

Write a format description of the reply message for a single discrete output

Write coil response

Serial number	Message Field	Length (bytes)	Bytes, storage mode	I1nstruction
1	Transaction identification	2	High Byte first	Usually a message serial number, the same as the request message
2	Protocol identification	2	High Byte first	The default is 0000
3	Message length	2	High Byte first	The data length, excluding transaction identification, protocol identification, and message length
4	Unit identification	1		Range from 0x00 ~ 0xff; local bit 0 or 1; rest for RS485 ports; from machine address
5	Function code	1	0x05	The related function code of Modbus communication protocol
6	Write address	2	High Byte first
7	Write value	2	High Byte first	Write 0XFF00 to enable output; write 0X0000 to stop output;

Example message description

Close the output of Channel 1

Request message:
31 A6 00 00 00 06 01 05 00 00 00 00
Reply message
31 A6 00 00 00 06 01 05 00 00 00 00

Enable the output of Channel 1

Request message:
31 A6 00 00 00 06 01 05 00 00 FF 00
Reply message
31 A6 00 00 00 06 01 05 00 00 FF 00

(4) Digital output signal multiple control commands

Protocol statement

Function code: 0x0F

Discrete output register 0x00-0x15 corresponds to output channel 1-16; this instruction is used to read the state of the current coil register.
When the output state is invalid, the indicator light goes out and returns to 0; when valid, the indicator light comes on and returns to 1;

Write a request packet format specification for multiple discrete outputs

Write multiple coil requests

Serial number	Message Field	Length (bytes)	Bytes, storage mode	Instruction
1	Transaction identification	2	High Byte first	It’s usually a message serial number
2	Protocol identification	2	High Byte first	The default is 0000
3	Message length	2	High Byte first	The data length, excluding transaction identification, protocol identification, and message length
4	Unit identification	1		Range from 0x00 ~ 0xff; local bit 0 or 1; rest for RS485 ports; from machine address
5	Function code	1	0x0F	The related function code of Modbus communication protocol
6	Starting address	2	High Byte first
7	Write length	2	High Byte first
8	Number of bytes of data written	1		Writes a data length of N bytes, then writes a data byte value of n
9	Write data	N	Low byte in front, high bit per byte, in front	Each byte corresponds to 8 bits of discrete output

Write format specifications for multiple discrete output reply packets

Write multiple coil responses

Serial number	Message Field	Length (bytes)	Bytes, storage mode	I1nstruction
1	Transaction identification	2	High Byte first	It’s usually a message serial number
2	Protocol identification	2	High Byte first	The default is 0000
3	Message length	2	High Byte first	The data length, excluding transaction identification, protocol identification, and message length
4	Unit identification	1		Range from 0x00 ~ 0xff; local bit 0 or 1; rest for RS485 ports; from machine address
5	Function code	1	0x0F	The related function code of Modbus communication protocol
6	Starting address	2	High Byte first
7	Write value	2	High Byte first

Example message description

1 ~ 16 channel output enable

Request message:
31 A6 00 00 00 09 01 0F 00 00 00 10 02 FF FF
Reply message
31 A6 00 00 00 06 01 0F 00 00 00 10

3 ~ 10 channel output enable

Request message:
31 A6 00 00 00 08 01 0F 00 02 00 08 01 FF
Reply message
31 A6 00 00 00 06 01 0F 00 02 00 08

(5) Input Register Acquisition Command

Protocol statement

Function code: 0x04

Input Register 0x00-0x05 corresponds to analog input channel 1-6
When the input port state is invalid, the indicator light goes out and returns to 0; when valid, the indicator light turns on and returns to 1;

Read Input Register request message format description

Read discrete INPUT REQUEST -MODBUSDTCP TCP packet format)

Serial number	Message Field	Length (bytes)	Bytes, storage mode	I1nstruction
1	Transaction identification	2	High Byte first	It’s usually a message serial number
2	Protocol identification	2	High Byte first	The default is 0000
3	Message length	2	High Byte first	The data length, excluding transaction identification, protocol identification, and message length
4	Unit identification	1		Range from 0x00 ~ 0xff; local bit 0 or 1; rest for RS485 ports; from machine address
5	Function code	1	0x04	The related function code of Modbus communication protocol
6	Starting address	2	High Byte first
7	Number of registers	2	High Byte first

Format description of read input register reply message

Read the discrete input reply (Modbus TCP message format)

Serial number	Message Field	Length (bytes)	Bytes, storage mode	I1nstruction
1	Transaction identification	2	High Byte first	Usually a message serial number, the same as the request message
2	Protocol identification	2	High Byte first	The default is 0000
3	Message length	2	High Byte first	The data length, excluding transaction identification, protocol identification, and message length
4	Unit identification	1		Range from 0x00 ~ 0xff; local bit 0 or 1; rest for RS485 ports; from machine address
5	Function code	1	0x04	The related function code of Modbus communication protocol
6	Data Length	1	High Byte first	N analog channels, data length value of 2n
7	Data	2n	Analog current input in front, low word in front

Example message description

For example, the analog voltage input is 10V, the analog current input is 20ma, and the analog current input is 6 channels

Request message:
00 04 00 00 00 06 01 04 00 00 00 06
Reply message
00 04 00 00 00 0F 01 04 0C 05 12 05 15 05 15 0F 80 0F 82 0F 88

5.2 Modbus RTU to MODBUT TCP Communication Mode

The module can transform Modbus RTU message of 485 ports into TCP message, and realize data conversion between Modbus RTU main station and MDOBUC TCP server. Here’s how it works:

5.2.1. Modbus RTU to Modbus TCP communication mode parameters

Parameter type	Detail
Default remote host IP	192.168.1.124
Default remote host port	8080
Number of supported connections	1
Native TCP Mode	Client
RS485 communication parameter	➢ Line 2: A to the 485 bus B-minus on 485 bus ➢ Default communication parameters: Baud rate: 9600,8 bit data, no parity, 1 bit stop, web configurable

5.2.2 Modbus RTU to Modbus TCP mode configuration

Step 1: Open the web page and go to the “Parameter configuration”screen. See section 5.3, “Page configuration parameters”for details
Step 2: select the 485 parameter as”Client”, as shown in the following figure

Step 3: configure the IP and Port of the Modbus TCP server on demand, as shown in the following figure

Step 4: Configure Module RS485 serial port parameters according to requirement, refer to section 5.3.2 for detailed operation
Step 5: Power Off and Restart module

5.3 page configuration parameters

Here’s how it works:

• Connect the module (through the switch) to the computer using a common network cable.
• Connect the external power supply of DC 24V to the module and electrify it. Before electrify, please check whether the positive and negative poles of the power supply are connected correctly.
• Open the browser with Google, Firefox, or Ie9 + and enter the current IP of the module (the default IP for the module is 192.168.1.15) .
• Enter the login password, the default password is 123456; the password can be changed through the web page.

5.3.1 Web login

Enter your password and click the “Log in”button to log in

Upon successful landing, the following is displayed:

5.3.2. Configure serial port parameters

Including the configuration of 485,232,422 port communication parameters, baud rate, stop bit, check bit.

Select the”[3] parameter configuration”button to enter, as shown in the following figure:

Take the configuration of 485 port communication parameters as an example

As shown below, configure baud rate, check bit, stop bit, and communication mode in “485 parameters”under “Serial parameters”.

5.3.3 configure module IP

As shown in the following figure, under parameter configuration, configure the IP, Gateway, and subnet mask in the local network parameters.

5.3.4 Set a login password

As shown in the figure below, under “Parameter configuration”, under “Login password”, just enter 6 digits.

5.4.5. Factory settings are restored

As shown in the figure below, first select “Functional configuration”.

In the pop-up page, select “Restore factory settings”and power off to restart, as follows:

5.4 TCP to RS232 transmission

This module supports converting any received message of 232 ports into TCP message and sending it; the TCP client receives the same message as the module 232 ports.

5.4.1 TCP to RS232 communication parameter description

Parameter type	Detail
Default module IP	192.168.1.15
Default Module Port	9232(unmodifiable)
Native TCP Mode	This machine acts as the TCP server
RS232 communication parameter	Line 3: 2-RXD, 3- TXD, 5- ground Default communication parameters: Baud rate: 9600,8 bit data, no check, 1 bit stop.

Explanation:
RS232 port communication parameters, baud rate, check bit and stop bit can be set through the web page.

5.4.2 TCP to RS232 communication settings

Step 1: Open the web page and go to the “Parameter configuration”screen. See section 5.3, “Page configuration parameters”for details

Step 2: set the required RS232 serial port parameters as shown in the following figure

Step 3: set up the module IP on Demand, refer to section 5.3.3 for detailed operations

Step 4: Power Off and restart the module

5.5 TCP to RS422 transmission

This module supports the conversion of any received message of port 422 into a TCP message and sending it; the TCP client receives the same message as the module 422

5.5.1 TCP to RS422 default communication parameter description

Parameter type	Detail
Default module IP	192.168.1.15
Default Module Port	9422(unmodifiable)
Native TCP Mode	This machine acts as the TCP server
RS422 communication parameter	Line 4: Module send: t + , T – Module receive: R + , R – Default communication parameters: Baud rate: 9600,8 bit data, no check, 1 bit stop.

Explanation:
RS422 port communication parameters, baud rate, check bit and stop bit can be set through the web page.

5.5.2 RS422 communication parameter setting

Step 1: Open the web page and go to the “Parameter configuration”screen. See section 5.3, “Page configuration parameters”for details

Step 2: set the required RS422 serial port parameters as shown in the following figure

Step 3: set up the module IP on Demand, refer to section 5.3.3 for detailed operations

Step 4: Power Off and restart the module

5.6 TCP to RS485 transmission

This module can convert any received message of port 485 to TCP message and send it. The TCP client receives the same message as that of Port 485

5.6.1, TCP to RS485 communication parameter description

Parameter type	Detail
Default module IP	192.168.1.15
Default Module Port	502(unmodifiable)
Native TCP Mode	Server penetration
RS485 communication parameter	Line 2: A to the 485 bus B-minus on 485 bus Default communication parameters: Baud rate: 9600,8 bit data, no check, 1 bit stop.

Explanation:
RS485 port communication parameters, baud rate, check bit and stop bit can be set through the web page.

5.6.2 TCP to RS485 configuration

Step 1: Open the web page and go to the “Parameter configuration”screen. See section 5.3, “Page configuration parameters”for details

Step 2: select parameter 485 for “Server penetration”

Step 3:485 serial port parameters and IP modification, detailed Operation Reference Section 5.3.2 and 5.3.3

Step 4: Power Off and restart the module

6.common problems

6.1. The power light doesn’t work

• Check the power supply, whether the reverse connection, whether the DC power supply, voltage is at least 9v;
• If the power is normal, the module may be damaged, please contact us to send back for repair.

6.2. The device is not communicating

• Whether through the module IP page to choose the correct 485 TCP communication mode and power off restart;
• Through the module IP page to see whether the module’s serial port parameters, network parameters and equipment matching;
• Whether power off and restart after modifying module parameters
• Use section 4.1.3 to determine if the cable is available.

6.3. Unable to access module IP pages

• Section 4.1.3 to determine if the network cable is usable;
• Check if the login IP is the current module IP;
• Attempts to change browsers such as Google, Firefox or IE9;
• Computer IP network segment is consistent with the module, whether the module IP and Computer IP conflict, whether the switch/router configuration is correct IP to the computer, module, etc. .

6.4. The page modification parameter did not succeed

• Click OK after the corresponding parameter;
• Power-off restart module modified parameters can be effective, whether there is a power-off restart;