//transmitter

#include <RS485_non_blocking.h>
#include <SoftwareSerial.h>
SoftwareSerial rsbus (2, 3);  // receive pin, transmit pin
const byte ENABLE_PIN = 4;

size_t fWrite (const byte what)
{
  return rsbus.write (what);
}

RS485 myChannel (NULL, NULL, fWrite, 0);

void setup ()
{
  rsbus.begin (9600);
  myChannel.begin ();
}  // end of setup

const byte msg [] = "Hello world";


void loop ()
{
  digitalWrite (ENABLE_PIN, HIGH);  // disable sending
  myChannel.sendMsg (msg, sizeof (msg));
  digitalWrite (ENABLE_PIN, LOW);  // disable sending
  delay (1000);
}  // end of loop