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This is a new test code i did but it works randomly.

#include <SimpleModbusMaster.h>

//////////////////// Port information ///////////////////
#define baud 9600
#define timeout 1000
#define polling 300 // the scan rate
#define retry_count 10

// used to toggle the receive/transmit pin on the driver
#define TxEnablePin 2 

#define LED 9

// The total amount of available memory on the master to store data
#define TOTAL_NO_OF_REGISTERS 1

// This is the easiest way to create new packets
// Add as many as you want. TOTAL_NO_OF_PACKETS
// is automatically updated.
enum
{
  PACKET1,
  PACKET2,
  TOTAL_NO_OF_PACKETS // leave this last entry
};

// Create an array of Packets to be configured
Packet packets[TOTAL_NO_OF_PACKETS];

// Masters register array
unsigned int regs[TOTAL_NO_OF_REGISTERS];

// constants won't change. They're used here to set pin numbers:
const int buttonPin = 3;     // the number of the pushbutton pin
const int ledPin =  8;      // the number of the LED pin

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);

  // Initialize each packet
//  modbus_construct(&packets[PACKET1], 1, FORCE_SINGLE_COIL, 0, 0xFF00, 0);
//  modbus_construct(&packets[PACKET2], 1, PRESET_MULTIPLE_REGISTERS, 4358, 1, 0);
  
  // Initialize the Modbus Finite State Machine
  modbus_configure(&Serial, baud, SERIAL_8N1, timeout, polling, retry_count, TxEnablePin, packets, TOTAL_NO_OF_PACKETS, regs);
  
  pinMode(LED, OUTPUT);
}

void loop() {
  
  regs[0] = analogRead(0); // update data to be written to arduino slave
  
  analogWrite(LED, regs[0]>>2); // constrain adc value from the arduino slave to 255
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
    // turn LED on:
    modbus_construct(&packets[PACKET2], 1, PRESET_MULTIPLE_REGISTERS, 4358, 0, 0);
     modbus_update();
    //digitalWrite(ledPin, HIGH);
  } else {
    modbus_construct(&packets[PACKET2], 1, PRESET_MULTIPLE_REGISTERS, 4358, 1, 0);
    modbus_update();
    // turn LED off:
    //digitalWrite(ledPin, LOW);
  }
}

Оживлю немного тему. ничего подходящего не нашел.

Идя, такая. Смотрю что пришло в порт и рересылаю. Все верно ?

#include <SoftwareSerial.h>

#define SSerialRX        10  //Serial Receive pin
#define SSerialTX        11  //Serial Transmit pin
SoftwareSerial RS485Serial(SSerialRX, SSerialTX); // RX, TX

void setup() 
{
 RS485Serial.begin(9600);
 Serial.begin(9600);
}

void loop() 
{
if (RS485Serial.available())
  {
     /*       
      digitalWrite(13, HIGH);  // Show activity
     delay(1000);
     digitalWrite(13, LOW);  // Show activity
     */
  int byteReceived = RS485Serial.read();
  delay(100);
  Serial.print(byteReceived, HEX);  
  }

  
}

Можете помочь с библиотекой для modbus?