TestRS485

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Master

/*
 * RS485 with MAX485 for control servo
 */ 
#include <SoftwareSerial.h>

#define SSerialRX           10  // Serial Receive pin
#define SSerialTX           11  // Serial Tansmit pin
#define SSerialTxControl    3   // RS485 Deriection Control
#define RS485Transmit       HIGH
#define RS485Receive        LOW

/*
 * Declare objects
 */
SoftwareSerial RS485Serial(SSerialRX, SSerialTX);

 /*
  * Declare Variables
  */
int byteReceived;
int deg = 0;
    
void setup()
{
    pinMode(Pin13LED, OUTPUT);
    pinMode(SSerialTxControl, OUTPUT);

    digitalWrite(SSerialTxControl, RS485Transmit);   // Init Tranceiver - receive
    RS485Serial.begin(4800);    // set data rate on the serial port
}

void loop()
{
    RS485Serial.write(deg);
    
    delay(250);

       deg += 2;
    if (deg >= 180) 
    {
        deg = 0;
    }
}

Slave

#include <SoftwareSerial.h>
#include <Servo.h>

#define SSerialRX           10  // Serial Receive pin
#define SSerialTX           11  // Serial Tansmit pin
#define SSerialTxControl    3   // RS485 Deriection Control
#define RS485Transmit       HIGH
#define RS485Receive        LOW
#define Pin13LED            13

SoftwareSerial RS485Serial(SSerialRX, SSerialTX);
Servo myservo;

int angle = 0;
int byteReceived;

void setup()
{
    myservo.attach(9, 450, 2100);
    
    pinMode(Pin13LED, OUTPUT);
    pinMode(SSerialTxControl, OUTPUT);

    digitalWrite(SSerialTxControl, RS485Receive);   // Init Tranceiver - receive
    RS485Serial.begin(4800);    // set data rate on the serial port

    Serial.begin(9600);
}

void loop()
{
    digitalWrite(SSerialTxControl, RS485Receive);

    if (RS485Serial.available())
    {
        //digitalWrite(Pin13LED, HIGH);
        byteReceived = RS485Serial.read();
        angle = byteReceived;
        Serial.println(angle);
    }
  
    myservo.write(angle);
    delay(10);
}

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