Unable to send data over RS232 (using serial_interface_01.lib)

Codesys V2.3 🇬🇧
JorTec
2017-01-10
2017-01-12

  • JorTec - 2017-01-10

    Hi all,

    I'm using the Wago 750-880 with the 750-650 to communicate over RS232. I'm using the serial_interface_01.lib (http://www.wago.com/wagoweb/documentati ... 10901e.htm). With this library I am able to receive data, but not sending data. This is the code I have so far:

    VAR
   COM2       : SERIAL_INTERFACE;
   xOpenPort2   : BOOL := TRUE;
   xInitPort2      : BOOL;
   xSendActive2   : BOOL;
   SendString2   : STRING := 'Msg from COM2';
   ReceiveBuffer2   : typRing_Buffer;
   index : INT;
END_VAR

    index := index+1;
IF index = 1000 THEN
   xSendActive2 := TRUE;
END_IF
IF index = 2000 THEN
   xSendActive2 := FALSE;
   index := 0;
END_IF
COM2(   bCOM_PORT_NR   := 2,
   (*   cbBAUDRATE      := wBaudRate,
      cbsBYTESIZE      := bDataBits,
      cpPARITY         := bParity,
      csSTOPBITS      := STOPBITS_1,
      cfFLOW_CONTROL   := bFlowControl,*)
      utRECEIVE_BUFFER    := ReceiveBuffer2,
      ptSEND_BUFFER   := ADR(SendString2),
      xINIT         := xInitPort2,
           xOPEN_COM_PORT    := xOpenPort2,
      iBYTES_TO_SEND   := LEN(SendString2) +1,
      xSTART_SEND      := xSendActive2 );

    Data should be sent when xSTART_SEND is TRUE? The function block does not reset this value to FALSE.

     

  • JorTec - 2017-01-11

    Apparently, the module has flow control enabled.... So it works now.

     

  • shooter - 2017-01-12

    if this counter is used as a type of counter then better use a task, you can time it.
    and check if buffer empty before putting data in to buffer.

     

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