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serial port COM1 is a serial communication based physical interface, serial communication means that information transfers in or out one bit at a time, it has a 25-pin, look at the figure below to see it’s image

Serial port

To access this port usng visual basic you have to use ActiveX named MScomm

This ActiveX comes with visual bsic from microsoft, it is used to make a serial connection with other devices such as phone network or your custom circuit.

to download this ActiveX you can follow this link:

 http://www.yes-tele.com/mscomm.ZIP from yes-tele.com

This ActiveX can be choosen and drag drop it to your form invisual basic.

At the first click on this ActiveX and go to OnComm()  event for it, this event run when there is a data recieved, you can directly receive data as the followig:

suppose we have a Mscomm instance called comm1 and a Text box called Text1

Private Sub comm1_OnComm()
  if(Comm1.CommEvent=’comEvReceive’) Then

  Text1.text=Comm1.Input ‘ get info from seral port

  End if

End Sub

 That is to receive data, to send data using command button called Command1 you will do this :

Private Sub Command1_Click()
Comm1.Output = “1234″ ‘this is to out data
End Sub

You can download an advanced example about serial communcation from here: http://www.yes-tele.com/download/vb60.zip

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