The MSComm control can use polling or an event-driven method to retrieve data from the port. This simple example uses the polling method. For an example of the event-driven method, see help for the OnComm event.
The following example shows how to handle communications errors and events. You can insert code after each related Case statement, to handle a particular error or event.
Private Sub MSComm_OnComm ()
Select Case MSComm1.CommEvent
' Handle each event or error by placing
' code below each case statement
' Errors
Case comEventBreak ' A Break was received.
Case comEventFrame ' Framing Error
Case comEventOverrun ' Data Lost.
Case comEventRxOver ' Receive buffer overflow.
Case comEventRxParity ' Parity Error.
Case comEventTxFull ' Transmit buffer full.
Case comEventDCB ' Unexpected error retrieving DCB]
' Events
Case comEvCD ' Change in the CD line.
Case comEvCTS ' Change in the CTS line.
Case comEvDSR ' Change in the DSR line.
Case comEvRing ' Change in the Ring Indicator.
Case comEvReceive ' Received RThreshold # of
' chars.
Case comEvSend ' There are SThreshold number of
' characters in the transmit
' buffer.
Case comEvEof ' An EOF charater was found in
' the input stream
End Select
End Sub
'Visual Basic Code
Related Link : MSComm Event More article and Resources Serial Port Programming
From: http://support.microsoft.com/default.aspx?scid=kb;en-us;823179
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