XBEE <-> A:SoftwareSerial <-> A:UART <-> MAX485 <-> RS485

#include <SoftwareSerial.h>
#define xbee_rx 10
#define xbee_tx 11

SoftwareSerial xbee(xbee_rx, xbee_tx);

void setup(){
  pinMode(xbee_rx, INPUT);
  pinMode(xbee_tx, OUTPUT);
  xbee.begin(9600);
  xbee.println("Hello, xbee");
  
  Serial.begin(9600);
  Serial.println("Hello, rs");
}

void loop(){
  if(Serial.available()){
    xbee.write(Serial.read());
  }
  if(xbee.available()){
    Serial.write(xbee.read());
  }
}

XBEE <-> MAX485 <-> RS485

#include <Wire.h>
#include <SoftwareSerial.h>
#include <MPU6050.h>

SoftwareSerial xbee(10, 11);
static const unsigned char req[]= {0x02, 0x00, 0x00, 0x01, 0x0A, 0x63, 0x06, 0x20, 0x00, 0x00, 0x00, 0xEC, 0xC3, 0x03};


void setup(){
  xbee.begin(9600);
  // Initialize the 'Wire' class for the I2C-bus.
  Wire.begin();
  // Clear the 'sleep' bit to start the sensor.
  MPU6050_write_reg (MPU6050_PWR_MGMT_1, 0);
  // Initialize the RS485; The dip switch should be on right pos.
  Serial.begin(9600);
}

void loop(){
  // print MPU6050 data to a SoftwareSerial
  printGyro(xbee);
  // request tracker status info (broadcast)
  Serial.write(req, 14);
  // give some time to respond
  delay(500);
  // write to xbee when there is RS485 message in.
  while(Serial.available()){
    xbee.print(Serial.read(), HEX);
    xbee.print(F(" "));
  }
  // time delay
  delay(500);
  // line feed
  xbee.println(F(""));
}