RS485 Shield for Arduino

This is an Arduino RS485 shield, especially designed for the Arduino controller board. It can easily convert the UART to the RS485. This shield integrates a standard RS485 port, a mini RS485 port (PH2.0 interface), RS485 headers, and provides the Welding areas, so it's convenient for your DIY design. One key changes automatic and manual transmission mode, which expand the scope of application.

Quick Spec

• Power Module: 5V
• Module Size: 55 x 53mm
• 16 digital IO port (including a I2C interface)
• 6 analog IO port and power
• Operation/programming mode switch
• Automatic/manual transceiver mode switch (When in manual transceiver mode, the enable end is the 2nd digital IO port)
• Transceiver indicating LED
• Standard RS485 interface, mini RS485 interface (PH2.0) and RS485 pins
• Reset button

Board Layout

Sample Code - Automatic Transmission Mode

/*
# This sample codes is for testing the RS485 shiled(automatic transmission mode).
# Editor : YouYou
# Date   : 2013.9.16
# Ver    : 0.1
# Product: RS485 shield
# SKU    : DFR0259
*/

int led = 13;
void setup()
{
  Serial.begin(9600);
  pinMode(led,OUTPUT);
}
void loop()
{
  int temp;
  if(Serial.available())
  {
    temp=Serial.read();
     if(temp=='V'){
      digitalWrite(led,1-digitalRead(led));
    Serial.println("OK");
     }
  }
}

Sample Code - Manual Transmission Mode

/*
# This sample codes is for testing the RS485 shiled(manual transmission mode).
# EN=2;
# Editor : YouYou
# Date   : 2013.9.16
# Ver    : 0.1
# Product: RS485 shield
# SKU    : DFR0259
*/
int led = 13;
int EN = 2;  //Definition RS485 shield enable terminal (the 2nd digital IO ports),
//high for the sending state, the low level of receiving state
void setup()
{
  Serial.begin(9600);
  pinMode(led,OUTPUT);
  pinMode(EN,OUTPUT);
}
void loop()
{
  int temp;
  digitalWrite(EN,LOW);    //Enable low, RS485 shield waiting to receive data
  if(Serial.available())
  {
    temp=Serial.read();
     if(temp=='V')
     {
      digitalWrite(led,1-digitalRead(led));
      digitalWrite(EN,HIGH);    //Enable high, RS485 shield waiting to transmit data
      Serial.println("OK");
      delay(10);    //Delay for some time, waiting for data transmitted
     }
  }
}

Resources

• Product Page
• Product Wiki
• Schematic

Shipping List

• 1 x RS485 Shield for Arduino