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Taidacent 2 Way Modbus Rtu Relay Module Switching Input and Outp

$10

Taidacent 2 Way Modbus Rtu Relay Module Switching Input and Outp

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Product Description

Introduction

The dual Mobdus 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 2-channel input signal detection and 2-channel relay output, which can be used in digital detection or power control occasions.

Parameter

Onboard Chip Onboard mature and stable 8-bit MCU and MAX485 level conversion chip
Communication protocol support standard Modbus RTU protocol
Communication interface support RS485/TTL UART interface
Communication baud rate 4800/9600/19200, default 9600bps, support power-down save
Optocoupler input signal range DC3.3-30V (this input is not available for relay control)
Output signal relay switch signal, support manual, flash word, flash mode, flash word / flash delay base is 0.1S, maximum can be set flash word / flash time is 0xFFFF * 0.1S = 65535 * 0.1 S=6553.5S
Device address range 1-255, default 255, support power-down save
Relay Onboard 1 channel 5V, 10A/250VAC 10A/30V DC relay, can continuously pick up 100,000 times, with diode effluent protection, short response time
Indicator Relay switch indicator
Power supply voltage DC7-24V with input anti-collision protection

Pin Diagram

2 Way Modbus Rtu Relay Module2 Way Modbus Rtu Relay Module

Pin description

  1. VCC, GND: DC7-24V power input
  2. DC3.3-30V optocoupler signal input: IN1: channel 1 positive; IN2: channel 2 positive; GND_IN: common terminal
  3. A+, B-: RS485 communication interface, A+, B- respectively connected to the external control terminal A+, B-
  4. Relay 1 switch signal output: NC1: Normally closed end, shorted to COM1 before the relay is closed, suspended after suction; COM1: common end; NO2: normally open end, the relay is suspended before being sucked, and shorted after COM1.
  5. relay 2 switch signal output: NC2: Normally closed, shorted to COM2 before the relay is closed, suspended after suction; COM2: common end; NO2: normally open end, the relay is suspended before being sucked, and shorted after connecting with COM2.
  6. Relay indicator: light up when the relay is closed
  7. GND, RXD, TXD: TTL level UART communication interface, GND, RXD, TXD are connected to the external control terminal GND, TXD, RXD

Introduction to the Modbus RTU instruction

The Modbus device performs related operations by receiving Modbus RTU instructions from an external control terminal (eg, the host computer/MCU). A frame instruction is generally composed of a device address, a function code, a register address, a register data, a check code, a frame length, and The function code is related. Generally, the first byte of each frame of data is the device address, and the range is 1-255, the default is 255 (ie OXFF), and the last 2 bytes are CRC. Assuming the device address is 255, the commonly used Modbus RTU instructions 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 third to fourth bytes of the transmission frame represent the relay address, and the addresses of relay 1 - relay 8 are 0x0000, 0 respectively. ×0001, 0×0002, 0×0003, 0×0004, 0×0005, 0×0006, 0×0007 (2) The 5th - 6th byte of the transmitted frame represents the data, 0XFF00 represents the open relay, and 0x0000 represents the closed relay. 2, close the 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, open relay No. 2 (manual mode) send: FF050001FF00C824 return as it is: FF050001FF00C8243, open the 2nd relay (manual mode)

Send: FF 05 00 01 FF 00 C8 24 return as it is: FF 05 00 01 FF 00 C8 24

4, close the 2nd relay (manual mode) send: FF 05 00 01 00 00 89 D4 return as it is: FF 05 00 01 00 00 89 D4 5, open all relays Send: FF 0F 00 00 00 08 01 FF 30 1D returns: FF 0F 00 00 00 08 41 D3

6,turn off all relays Send: FF 0F 00 00 00 08 01 00 70 5D returns: 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 Remark: The 9th byte of the transmitted frame 0×01 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 Remark: The 9th byte of the transmitted frame 0xFF is the device address written 9, read the device address Send: 00030000000185DBReturn: 0003 02 00FF C5C4 Remark: The 5th byte of the returned frame 0xFF is the read device address 10, read the relay status Send: FF 01 00 00 00 08 28 12 Return: FF 01 01 01 A1 A0

Remark: The 4th byte of the return frame 0x01 BitO--Bit7 represents relay 1--relay 8, 0 is off, 1 is on 11, read the optocoupler input state Send: FF 02 00 00 00 08 6C 12 Return: FF 02 01 01 51A0 Remarks: The 4th byte of the return frame 0×01 IN1--lN8 represents the optocoupler 1--optocoupler 8 input signal, 0 represents low level, 1 represents high level 12, set the baud rate to 4800 Send: FF 10 03 E9 00 01 02 00 02 4A 0C Return: FF 10 03 E9 00 01 C5 A7 Remark: The ninth byte of the transmitted frame is the baud rate setting value, 0×02, 0×03, ×04 respectively represent 4800, 9600, 19200 13, set the baud rate to 9600 send: FF 10 03 E9 00 01 02 00 03 8B CC return: 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 OE return: FF 10 03 E9 00 01 C5 A7 15, read baud rate Send: FF 03 03 E8 00 01 11A4 Return: FF 03 02 00 04 90 53 Remark: The 5th byte of the returned frame represents the read baud rate, 0×02, 0×03, ×04 represent 4800, 9600, 19200 respectively. 16, open the No. 1 relay (flash mode 2S) send: FF 10 00 03 00 02 04 00 04 00 14 C5 9F return: FF 10 00 03 00 02 A416 Remarks: (1) The third to fourth bytes of the transmission frame represent the relay address, the address of relay 1 - relay 8 is 0 × 0003 , 0×0008, 0×000D, 0×0012, 0×0017, 0×001C, 0×0021, 0×0026 (2) The 10th to 11th bytes of the transmitted frame represent the delay setting value, and the delay base is 0.1S, so the delay time is 0×0014*0.1=20*0.1S=2S, and the relay automatically turns on 2S. shut down 17, close the relay No. 1 (flash mode 3S) send: FF 10 00 03 00 02 04 00 02 00 1E A5 99 return: FF 10 00 03 00 02 A4 16 Remarks: (1) The 3rd to 4th bytes of the transmission frame represent the relay address, and the addresses of Relay 1 - Relay 8 are 0x0003, 0x0008, 0x000D, 0x0012, 0x0017, respectively. 0×001C, 0×0021, 0×0026 (2) The 10th to 11th bytes of the transmitted frame represent the delay setting value, and the delay base is 0.1S, so the delay time is 0×001E*0.1=30*0.1S=3S, and the relay is automatically turned off after 3S. open

Connect Wire and Tools

Modbus Relay BoardModbus Relay Board

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 uses the host computer software to open the relay 1 through the RS485 interface. (Manual mode) As an example, suppose the device address is 255 and the baud rate is 9600. The steps are as follows: 1, VCC, GND are connected to the positive and negative poles of the power supply; 2, A+, B- respectively USB to RS485 module output A+ and B-; 3, open the host computer software "ModbusRTU configuration tool", select the correct port number, the baud rate select 9600, the address is set to 255, click "open serial port"; 4, then click "JD1 open" to open relay 1, and the indicator of relay 1 is lit.

check code

Modbus Controlled RelayModbus Controlled Relay

How to generate a check code

When the Modbus RTU instruction is sent through the existing host computer software (such as: ModbusRTU configuration tool), the CRC check code is automatically generated. If you want to use the serial debugging software (such as SSCOM) to test the Modbus relay module, you need to manually generate the CRC The check code is placed at the end of the transmitted frame, for example, to open the first relay (manual mode):

  1. The transmission frame composition of opening/closing relay (manual mode) is: Device address (1Byte) + function code (1Byte) + register address (2Byte) + register data (2Byte) + CRC check code (2Byte)
  2. Assuming the device address is 0xFF, the first 6 bytes of the transmitted frame are: FF O50000FF00
  3. Use the CRC check tool to find the check code for these 6 bytes:
  4. After exchanging the high and low byte positions of the verification calculation result E499, the CRC check code 99E4 is obtained, and the complete sending frame: FF050000FF0099E45, send the sending frame to the Modbus relay module through the serial debugging software SSCOM V5.13.1 to open the first One relay (manual mode), as last pic.

Taidacent 2 Way Modbus Rtu Relay Module Switching Input and Outp

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