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RS232 Serial communication problems

  • runar@samey.is

    runar@samey.is - 2013-10-21


    I am new to this forum and I am just beginning to us codesys.

    I am trying to get communication between berghof EC1000 and roboteq 2130. I am using 232 serial port. I am using a program I got from the codesys store ( http://store.codesys.com/serial-com.html ). I am using Codesys v3.5 SP1 Patch 4.

    My problem is that I can send one message through the serial port whit out any problems, but when I try to do it again nothing happens. Then I have to logout from the project and download it again to be able to send the messages again.

    Can anybody please help me with this problem?

  • runar@samey.is

    runar@samey.is - 2013-10-23

    I have tried it with and without handshake. I have also tried it without closing the port between sending messages. Here is the code I am using.

    IF xStartTest THEN

    //The parameters are set for the COM Port
    aCom1Params[1].udiParameterId := COM.CAA_Parameter_Constants.udiPort;
    aCom1Params[1].udiValue := 1; // the correct Port should be adapted
    aCom1Params[2].udiParameterId := COM.CAA_Parameter_Constants.udiBaudrate;
    aCom1Params[2].udiValue := 115200;
    aCom1Params[3].udiParameterId := COM.CAA_Parameter_Constants.udiParity;
    aCom1Params[3].udiValue := COM.PARITY.NONE;
    aCom1Params[4].udiParameterId := COM.CAA_Parameter_Constants.udiStopBits;
    aCom1Params[4].udiValue := COM.STOPBIT.ONESTOPBIT;
    aCom1Params[5].udiParameterId := COM.CAA_Parameter_Constants.udiTimeout;
    aCom1Params[5].udiValue := 0;
    aCom1Params[6].udiParameterId := COM.CAA_Parameter_Constants.udiByteSize;
    aCom1Params[6].udiValue := 8;
    aCom1Params[7].udiParameterId := COM.CAA_Parameter_Constants.udiBinary;
    aCom1Params[7].udiValue := 0;

    // Handshake Paramet

    //aCom1Params[8].udiParameterId := COM.udiDtrControl;
    //aCom1Params[8].udiValue := 16#02; // handshake
    //aCom1Params[9].udiParameterId := COM.udiOutxDsrFlow;
    //aCom1Params[9].udiValue := 1; // true
    //aCom1Params[10].udiParameterId := COM.udiRtsControl;
    //aCom1Params[10].udiValue := 16#02; // handshake
    //aCom1Params[11].udiParameterId := COM.udiOutxCtsFlow;
    //aCom1Params[11].udiValue := 1; // true

    // Handshake Parameter

    aCom1Params[8].udiParameterId := COM.udiInX;
    aCom1Params[8].udiValue := 1; // true
    aCom1Params[9].udiParameterId := COM.udiXonChar;
    aCom1Params[9].udiValue := 17;
    aCom1Params[10].udiParameterId := COM.udiXonLim;
    aCom1Params[10].udiValue := 2048;
    aCom1Params[11].udiParameterId := COM.udiOutX;
    aCom1Params[11].udiValue := 1; // true
    aCom1Params[12].udiParameterId := COM.udiXoffChar;
    aCom1Params[12].udiValue := 19;
    aCom1Params[13].udiParameterId := COM.udiXoffLim;
    aCom1Params[13].udiValue := 512;
    aCom1Params[14].udiParameterId := COM.udiTXContinueOnXoff;
    aCom1Params[14].udiValue := 0; // false


    IF xPortOpen THEN
    //The first Port is opened with the given parameters
    como1(xExecute := TRUE, usiListLength:=SIZEOF(aCom1Params)/SIZEOF(COM.PARAMETER),pParameterList:= ADR(aCom1Params));

    IF como1.xError THEN
    xCom1OpenError := TRUE;
    iState := 1000;
    IF como1.xDone THEN
    iState := 10;


    IF xWrite THEN
    // the write process is started for the first port
    comw1(xExecute := TRUE,hCom:= como1.hCom,pBuffer:= ADR(sWrite),szSize:= SIZEOF(sWrite));

    IF comw1.xError THEN
    xCom1WriteError := TRUE;

    // if the writing process is completed the reading process can be started
    IF comw1.xDone THEN
    iState := 15;

    IF xPortClose THEN

    // The first port is closed and the used handle released
    comc1(xExecute := TRUE, hCom:= como1.hCom);

    IF comc1.xError THEN
    xCom1CloseError := TRUE;

    IF comc1.xDone OR comc1.xError THEN
    iState := 1000;

  • timvh

    timvh - 2013-10-29

    You call comw1 only with execute := true.
    This is the trigger to start.
    To trigger it again, call the FB with execute := false at least one time in between.


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