Visual Foxpro Serial Communication Protocol

Posted on by
W Van Der Velde
  1. C A M Hooijschuur
  2. University Medical Center Groningen

SuperCom is a versatile data communication library for Serial Communication. SMTP and ESMTP protocols with. Controls for Visual Basic, FoxPro. Dec 12, 2001 Enable serial port. Enable serial port. I´m using visual foxpro 6.0. You'll need to find another 3rd party control to handle the serial communication.

Sorry, I can't point you to an idiot's guide, as I haven't really seen any either. But I can maybe give you a little insight from my experience. Which at times has involved some idiocy. There are libraries and packages you can buy that may be a lot more graceful, but if you don't mind a little grunt work here is a brief example to get you started. The only way I've done serial communications using VFP so far has been with the Microsoft MSComm control.

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C A M Hooijschuur

I would just start with some simple little test project to get a bit comfortable. Create a form and drop an instance of the comm control on it. You can get access to it in the usual way, from the Tools->Options->Controls->Microsoft Communications Control.

This will add it to your form controls Active X controls dialog. In the form's 'Init', add this statement: _VFP.AUTOYIELD =.F. In your comm control's 'Init', put something like this. CODE IF (THIS.commEvent == 1) &&. Xmit *THISFORM.iTx.PICTURE = 'dead.ico' &&. Turns off LED after command button turned it on RETURN ENDIF &&. Something residual in the buffer IF THIS.InBufferCount > 0 AND THIS.commEvent # 2 IF THIS.commEvent > 1000 &&.

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University Medical Center Groningen

Some sort of comm error. Close, reopen, re-init This.PortOpen =.F. DOEVENTS x = INKEY(1, 'HM') THIS.Settings = '9600,N,8,1' THIS.RThreshold = 1 This.SThreshold = 1 THIS.InputLen = 100 THIS.inBufferSize = 1024 THIS.CommPort = THISFORM.nPort DOEVENTS x = INKEY(1, 'HM') ENDIF RETURN ENDIF &&. We have data, let's react to it IF (THIS.commEvent == 2) DO WHILE THIS.InBufferCount > 0 cInString = THIS.INPUT DOEVENTS x = INKEY(.1, 'HM') DO CASE *.

If we get a ACK, send ENQ CASE ASC(cInString ) = ACK THIS.OUTPUT = CHR(nENQ) DOEVENTS x = INKEY(.1, 'HM') *. If we get a ENQ, send ACK CASE ASC(cInString ) = nENQ THIS.OUTPUT = CHR(ACK) DOEVENTS x = INKEY(.1, 'HM') OTHERWISE *. Otherwise, concat the buffer THISFORM.cInString = THISFORM.cInString + cInString ENDCASE ENDDO &&. Here, you can respond to whatever you receive, parsing the data or values and dealing with them. Is the string all there? Is there an end-of-string, CRC.

RETURN Hope that helps a little. -Dave Summers- Even more Fox stuff at: RE: Serial port comms.