Read data from serial port: Using source on same computer

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4.00/5 (1 vote)

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Hello everyone,

I'm attempting to do serial communication from within a c++ program.
"When it's done" it will deal with communication PC <-> mController.

I found the CSerial library which I think I will use, see here:
Serial library for C++[^]

To test that receiving data works I want to use a "GPS Simulator" from here:
http://www.skylab-mobilesystems.com/en/products/gps_sim.html[^]

However, as soon as I start outputting the GPS NMEA sentences from within the GPS simulator the COM-ports status goes to "busy".

If I then attempt to open a port from within my C++ code this doesn't work anymore.

CSerial serialPort;
serialPort.Open(_T("COM1"));

Has anyone attempted something similar?
Do I need to handle this differnly from the C++ side?
Or did I misunderstand the purpose of the "GPS Simulator"?
Could be it outputs the signal to the COM port where it could be read by external devices connected to the port ... not completely sure.

If my attempt is something not easily doable, what are alternatives which allow me to test communication without actually having connected the device which will be "on the other end"?

Posted 20-May-11 0:16am

tschoni

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2 solutions

Solution 2

VB

End If
          Dim Str As String = Nothing
          Dim StrArray() As String = Nothing
          With objPort
              If CurrentDataMode = DataMode.Text Then
                  Str = .comPort.ReadLine()
                  StrArray = Split(Str, ":")
                  For i As Integer = 0 To StrArray.Length - 1
                      If i = 0 Then
                          .PortTds = StrArray(i).ToString
                      End If
                      If i = 1 Then
                          .PortHighPh = StrArray(i).ToString
                      End If
                      If i = 2 Then
                          .PortLowPh = StrArray(i).ToString
                      End If
                  Next
              Else
                  Try
                      Dim bytes As Integer = .comPort.BytesToRead
                      Dim buffer(CInt(bytes - 1)) As Byte
                      .comPort.Read(buffer, 0, bytes)
                      Str = ByteArraytohexString(buffer)
                  Catch ex As Exception
                      MsgBox("The Entered values are not in correct format" & vbCrLf & ex.Message)
                  End Try
                  StrArray = Nothing
                  StrArray = Split(Str)
                  For i As Integer = 0 To StrArray.Length - 1
                      If i = 0 Then
                          .PortTds = StrArray(i).ToString
                      End If
                      If i = 1 Then
                          .PortHighPh = StrArray(i).ToString
                      End If
                      If i = 2 Then
                          .PortLowPh = StrArray(i).ToString
                      End If
                  Next
              End If
              Me.txtPortAdd.Text = .PortName
              Me.txtPortStatusRead.Text = .PortStatus
              Me.txtReadHighPh.Text = .PortHighPh
              Me.txtReadPhLow.Text = .PortLowPh
              Me.txtReadTDS.Text = .PortTds

Posted 19-Jul-11 19:26pm

Omparkash

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barneyman · Accepted Answer · 2011-05-20T13:39:00

it looks like that product outputs the NMEA over the com port so another external device can consume it - not really what you're after

Either connect another computer with a null modem cable (or a computer to itself if it has 2 com ports) or use a virtual serial driver that understands how to loopback - something like http://www.eltima.com/products/vspdxp/[^] may help you achieve what you want ... not endorsing it, first thing i found when i googled