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Posted on 1998-06-26
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Last Modified: 2010-05-03
This seems like a really easy question, but could somebody help me.  I am trying to communicate with a serial comm port through visual basic and I don't know the commands to use to open the port or to send a simple string command to an external module,
                 Thanks,  
 
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Question by:maddux
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clifABB earned 50 total points
ID: 1464433
You should use the MSComm control.
The following simple example shows basic serial communications using a modem:
Private Sub Form_Load ()
  ' Buffer to hold input string
  Dim Instring As String
  ' Use COM1.
  MSComm1.CommPort = 1
  ' 9600 baud, no parity, 8 data, and 1 stop bit.
  MSComm1.Settings = "9600,N,8,1"
  ' Tell the control to read entire buffer when Input
  ' is used.
  MSComm1.InputLen = 0
  ' Open the port.
  MSComm1.PortOpen = True
  ' Send the attention command to the modem.
  MSComm1.Output = "AT" + Chr$(13)
  ' Wait for data to come back to the serial port.

  Do
    DoEvents
  Loop Until MSComm1.InBufferCount >= 2
  ' Read the "OK" response data in the serial port.
  Instring = MSComm1.Input
  ' Close the serial port.
  MSComm1.PortOpen = False
End Sub


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