# 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 po

rts),

//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 transm

it data

Serial.println("OK");

delay(10);

//Delay for some time, waiting for data transmitted

}

}