Question

I am reading data from a police scanner using C# and serial ports (USB to Serial). When I view the data in a different program there’s no problem. When I use the following code I get repeat (duplicate) lines for everything. What am I doing wrong?

SerialPort _sp = new SerialPort();
_sp.BaudRate = 115000;
_sp.DataBits = 8;
_sp.Parity = Parity.None;
_sp.StopBits = StopBits.One;

and the function to start serial port reading…

public void StartSerial()
{
    _sp.PortName = comboPorts.SelectedItem.ToString();
    _sp.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived);
    _sp.Open();
}

and the read function…

private void serialPort_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
    try
    {
        String strLine = _sp.ReadLine();
        // Handle Data
    }
    catch { }
}

The manual states the following is required:

To view CCDump data, connect the radio to a personal computer using the USB PC/IF cable. Start a terminal program or your third party application software. Configure the communications parameters for “115200, N, 8, 1” as follows:

COM Port: The COM port number assigned to the USB cable by your computer. If you are running a Windows operating system, you can find this information under “Ports” in the Device Manager.

Parity: None

Baud Rate: 115,000 bits per second

Word: 8 bits

Stop Bits: 1

Answer 1

Ok, I found the answer. The data is being sent as duplicates so there’s nothing I can do.