// Receive RS485 data and send back an answer
private static void comDataReceived(object sender, SerialDataReceivedEventArgs e)
{
if (rs485 == null)
{
return;
}
int dataLength = rs485.rxBytesLength();
if (dataLength < 16)
{
return;
}
byte[] rxBuffer = new byte[dataLength];
rs485.Read(rxBuffer, 0, dataLength);
// Conver to string
String rxString = "";
try
{
rxString = new String(System.Text.Encoding.UTF8.GetChars(rxBuffer));
Debug.Print(rxString);
}
catch (System.Exception exception)
{
}
// Send back an answer
byte[] txBuffer = rxBuffer;
if (rxString.CompareTo(pingString) == 0)
{
txBuffer = System.Text.Encoding.UTF8.GetBytes(pongString);
}
rs485.Write(txBuffer);
}
public static void Main()
{
// Instantiate the main RS485Shield handler
rs485 = new RS485Shield("COM1", 9600, Parity.None, 8, StopBits.One, Pins.GPIO_PIN_D2);
// Add a suitable RxEvent Handler Callback
rs485.initHandlers(new SerialDataReceivedEventHandler(comDataReceived), null);
long lastTick = Utility.GetMachineTime().Ticks;
// Endless loop.
while (true)
{
long curTick = Utility.GetMachineTime().Ticks;
if ((curTick - lastTick) > timePeriod)
{
// Because I'm the "ping actor", just start a ping-pong game
rs485.Write(txBuffer);
// repeat each second
lastTick = curTick;
}
}
}