Serial Port Complete - Latest Microcontroller projects

Chapter 13

 // Uncomment one of these lines to indicate the method of controlling the RS-485
// driver-enable line.

private bool softwareDriverEnable = true; // software control

//private bool softwareDriverEnable = false; // hardware control

private bool driverDisable;

private void Send_Command( string node, string command, string address, string data )

{

string dataSent = null;

string response = null;

// Define LF as the NewLine character for serial data.

myComPort.NewLine = System.Convert.ToString((char)10);

if (softwareDriverEnable)

{

Rs485DriverEnableControl(true);

}

// Write a command to the serial port.

myComPort.WriteLine( ":" + node + command + address + data );

if (softwareDriverEnable)

{

// Read back what was transmitted to ensure that all of the data goes out.

// Then disable the RS-485 driver.

// The RS-485 transceiver's receiver must be permanently enabled

// in hardware.

dataSent = myComPort.ReadLine();

Rs485DriverEnableControl(false);

}

// Read and decode the response.

response = myComPort.ReadLine( );