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access to com port from Excel VBA?

Posted on 1998-04-11
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Last Modified: 2011-10-03
Is it possible to read/write to COM port from VBA modul from Excel?
TWA.
Oleg Korsak
omk@iname.com
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Question by:omk
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2 Comments
 
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by:kamall
ID: 1461044
If you have the MSCOMM control in the toolbox, you can access the COM port.
I can give you the VB code.
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Accepted Solution

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kamall earned 200 total points
ID: 1461045
This is a sample code:
Put one COM control, 2 text boxes, and one commend button on your form, and enter this code in the command1_Click event:
(This code sends command to the modem and gets the reply. Run the project and enter the modem command in Text1 box and click the command button)

Private Sub Command1_Click()
Comm1.PortOpen = True
Text2.Text = "WAIT..."

    ' Flush the input buffer.
    Comm1.InBufferCount = 0
    Comm1.OutBufferCount = 0
    'Send command
    Comm1.Output = Text1.Text + Chr(13)
   
    ' Wait for 5 seconds for answer to come back from the modem.
    x = Timer
    Do
       dummy = DoEvents()
       ' If there is data in the buffer, then read it.
       If Comm1.InBufferCount Then
          FromModem$ = FromModem$ + Comm1.Input
       End If
    Loop Until Timer = x + 5
Text2.Text = FromModem$

Comm1.PortOpen = False
End Sub


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