AC 220V Modbus RTU 4 Channel Relay Module Switch RS485/Ttl Uart Interface Four-Way Input Output DC3.3-24V Optocoupler Signal

• Customization: Available
• Usage: Computer, Workstation, Server, Mobile phone, Laptop
• Type: Wireless
• Model NO.: RTU 4 Channel Relay Module
• Support Network: GSM
• Information content: Data
• Certification: CE, RoHS
• Condition: New
• Selling Units: Single Item
• Product Name: RTU 4 Channel Relay Module
• Single Gross Weight: 0.100 Kg
• Single Package Size: 22X15X12.Cm
• MOQ: 10PCS
• Transport Package: Standard Packing
• Specification: /
• Trademark: /
• Origin: Guangdong, China
• HS Code: 0000000
• Production Capacity: 50000PCS/ Month

Product Description

Product Description

Overview:
The 220V four-channel Modbus relay module is equipped with a mature and stable 8-bit MCU and RS485 level communication chip. Using standard MODBUS RTU format RS485 communication protocol, it can realize 4-channel input signal detection and 4-channel relay output, which can be used for digital detection or power control occasions.
Functional characteristics:
1,Onboard mature and stable 8bit MCU and MAX485 level conversion chip;
2,  Communication protocol: support standard Modbus RTU protocol;
3,Communication interface: support RS485/TTL UART interface;
4,Communication baud rate: 4800/9600/19200, default 9600bps, support power-off save;
5,Optocoupler input signal range: DC3.3-24V (this input cannot be used for relay control);
6,Output signal: relay switch signal, support manual, flash off, flash off mode, flash off/flash off delay base is 0.1S, the maximum flash off/flash off time can be set to 0xFFFF*0.1S=6553.5S;
7,Device address: range 1-255, default 255, support power-off save;
8,Baud rate, input signal, relay status, device address can be read by software/command;
9,Onboard 4 5V, 10A/250V AC 10A/30V DC relays, which can be activated continuously for 100,000 times, have diode effusion protection, and have a short response time;
10,On-board relay switch indicator light;
11,Power supply voltage: AC220V

condition	brand new
warranty	180 days

1,Power input: AC 220V power input terminal;
2,Indicator light: four-way relay indicator light and power indicator light;
3,DC3.3-24V optocoupler signal input:
IN1: Channel 1 positive
IN2: Channel 2 positive
IN3: Channel 3 positive
IN4: Channel 4 positive
GND_IN: Common terminal negative
4,A+, B-: RS485 communication interface, A+, B- are respectively connected to A+, B- of the external control terminal;
5,GND, RXD, TXD: TTL level UART communication interface, GND, RXD, TXD are respectively connected to the GND, TXD, RXD of the external control terminal, and support the connection of 3.3V/5V external TTL serial ports;
6,RS485 and TTL serial port selection. When using RS485 communication, DI connects to TXD and RO connects to RXD; when using TTL communication, both DI and RO connect to the NC terminal.
7,4 independent relay switch signal output:
NC: normally closed, the relay is short-connected with COM before it is closed, and it is suspended after it is closed;
COM: public end;
NO: Normally open end, the relay is suspended before being closed, and shorted to COM after being closed.
Introduction to Modbus RTU instruction:
Modbus devices perform related operations by receiving Modbus RTU instructions from an external control terminal (such as host computer/MCU). A frame of instructions generally consists of device address, function code, register address, register data, and check code. The frame length and Function code is related. Generally, the first byte of each frame of data is the device address, the range of which can be set is 1-255, the default is 255 (ie 0xFF), and the last 2 bytes are the CRC check code.

Assuming the device address is 255, the commonly used Modbus RTU commands are as follows:

1,Turn on relay No. 1 (manual mode)
Send: FF 05 00 00 FF 00 99 E4
Return as it is: FF 05 00 00 FF 00 99 E4
Remarks:
(1) The 3-4 bytes of the sending frame represent the relay address. The addresses of relay 1-relay 8 are 0x0000, 0x0001,0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007
(2) The 5-6 bytes of the sending frame represent data, 0xFF00 represents opening the relay, and 0x0000 represents closing the relay

2,Turn off relay No. 1 (manual mode)
Send: FF 05 00 00 00 00 D8 14
Return as it is: FF 05 00 00 00 00 D8 14

3,Turn on relay No. 2 (manual mode)
Send: FF 05 00 01 FF 00 C8 24
Return as it is: FF 05 00 01 FF 00 C8 24

4,Turn off relay No. 2 (manual mode)
Send: FF 05 00 01 00 00 89 D4
Return as it is: FF 05 00 01 00 00 89 D4

5,Turn on all relays
Send: FF 0F 00 00 00 08 01 FF 30 1D
Return: FF 0F 00 00 00 08 41 D3

6,Close all relays
Send: FF 0F 00 00 00 08 01 00 70 5D
Return: FF 0F 00 00 00 08 41 D3

7,Set the device address to 1
Send: 00 10 00 00 00 01 02 00 01 6A 00
Return as it is: 00 10 00 00 00 01 02 00 01 6A 00
Remarks: The 9th byte 0x01 of the sending frame is the written device address

8,Set the device address to 255
Send: 00 10 00 00 00 01 02 00 FF EB 80  
Return as it is: 00 10 00 00 00 01 02 00 FF EB 80
Remarks: The 9th byte of the sending frame, 0xFF, is the written device address

9,Read device address
Send: 00 03 00 00 00 01 85 DB
Returns: 00 03 02 00 FF C5 C4
Remarks: The 5th byte of the return frame, 0xFF, is the device address read

10.Read the relay status
Send: FF 01 00 00 00 08 28 12
Returns: FF 01 01 01 A1 A0
Remarks: Bit0--Bit7 of the 4th byte of the return frame 0x01 represent relay 1--relay 8, 0 is closed, 1 is open

11,Read optocoupler input status
Send: FF 02 00 00 00 08 6C 12
Returns: FF 02 01 01 51 A0
Remarks: IN1--IN8 of the 4th byte of the return frame 0x01 represents the input signal of optocoupler 1--optocoupler 8, 0 represents low level, and 1 represents high level

12, Set the baud rate to 4800
Send: FF 10 03 E9 00 01 02 00 02 4A 0C
Returns: FF 10 03 E9 00 01 C5 A7
Remarks: The 9th byte of the sent frame is the baud rate setting value, 0x02, 0x03, and x04 represent 4800, 9600, 19200 respectively

13,Set the baud rate to 9600
Send: FF 10 03 E9 00 01 02 00 03 8B CC
Returns: FF 10 03 E9 00 01 C5 A7

14,Set the baud rate to 19200
Send: FF 10 03 E9 00 01 02 00 04 CA 0E
Returns: FF 10 03 E9 00 01 C5 A7

15,Read baud rate
Send: FF 03 03 E8 00 01 11 A4
Returns: FF 03 02 00 04 90 53
Note: The 5th byte of the return frame represents the baud rate read, 0x02, 0x03, and x04 represent 4800, 9600, 19200 respectively

16,Turn on relay No. 1 (flash close mode 2S)
Send: FF 10 00 03 00 02 04 00 04 00 14 C5 9F
Returns: FF 10 00 03 00 02 A4 16
Remarks:
(1) The 3-4 bytes of the sending frame represent the relay address, the addresses of relay 1-relay 8 are 0x0003, 0x0008, 0x000D, 0x0012, 0x0017, 0x001C, 0x0021,0x0026
(2) The 10th-11th byte of the sending frame represents the delay setting value, the delay base is 0.1S, so the delay time is 0x0014*0.1=20*0.1S=2S, and the relay is turned off automatically after 2S.

17,Turn off relay No. 1 (flash mode 3S)
Send: FF 10 00 03 00 02 04 00 02 00 1E A5 99
Returns: FF 10 00 03 00 02 A4 16
Remarks:
(1) The 3-4 bytes of the sending frame represent the relay address, the addresses of relay 1-relay 8 are 0x0003, 0x0008, 0x000D, 0x0012, 0x0017, 0x001C, 0x0021,0x0026
(2) The 10th-11th byte of the sent frame represents the delay setting value, the delay base is 0.1S, so the delay time is 0x001E*0.1=30*0.1S=3S, and the relay is turned off automatically after 3S


Simple instructions:
The Modbus relay module can receive Modbus RTU commands from the host computer/MCU via the RS485/TTL UART interface to perform related operations. The following is an example of using the host computer software to open relays 1 and 2 (manual mode) through the RS485 interface. Assuming that the device address is 255 and the baud rate is 9600, the steps are as follows:
1,L and N are connected to 220V power supply;
2,A+, B-respectively USB to A+ and B- of the output terminal of the RS485 module;
3,Open the host computer software "ModbusRTU configuration tool", select the correct port number, select 9600 for the baud rate, set the address to 255, and click "open serial port";
4,Then click "JD1 Open" to turn on Relay 1, and the indicator of Relay 1 will be on at the same time. As shown below:

Company Information

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