ESP32 with RS485 16 Channel Relay Module Connection and Code

I searched a lot of sites and more tutorials to find the accurate code to control this type of relay. but I cannot find the correct code solution. After researching for three days, I found the correct code and solution for it. I will use it in my future projects. happy to share with you.

RS485 Wiring

Code



#include <ModbusMaster.h>

int  pool_size1;

#define RX2 16       //RX

  
  
  define TX2 17       //TX


ModbusMaster node1;  //ModbusRTU Relay Slave ID1

int8_t  pool_size;

void setup()

{ 

  Serial.begin(9600);

  Serial2.begin(19200, SERIAL_8N1, RX2, TX2);  //RX2=16,RO ,TX2=17, DI

  node1.begin(1, Serial2);

Serial.println("successfully node bigining");

  delay(1000);

pool_size = node1.writeSingleRegister(0x01, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x02, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x03, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x04, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x05, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x06, 0x0100);

   delay(1000);

  pool_size = node1.writeSingleRegister(0x07, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x08, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x09, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x0A, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x0B, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x0C, 0x0100);

  delay(1000);

pool_size = node1.writeSingleRegister(0x0D, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x0E, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x0F, 0x0100);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x10, 0x0100);

delay(5000);

  Serial.println("Attempting to turn off relay");

pool_size = node1.writeSingleRegister(0x01, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x02, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x03, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x04, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x05, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x06, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x07, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x08, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x09, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x0A, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x0B, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x0C, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x0D, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x0E, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x0F, 0x0200);

  delay(1000);

  pool_size = node1.writeSingleRegister(0x10, 0x0200);

  delay(5000);

Serial.println("Attempting to turn on all relays");

  pool_size = node1.writeSingleRegister(0x00, 0x0700);

  delay(5000);

Serial.println("Attempting to turn off all relays");

  pool_size = node1.writeSingleRegister(0x00, 0x0800);

  delay(5000);

}

void loop()

{

}

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ESP32 with RS485 16 Channel Relay Module Connection and Code

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RS485 Wiring

Code

define TX2 17 //TX

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