Monitoring RS232 Communication

[aderogba]

Please is there a way to monitor RS232 communication traffic via VI? 

[Taki1999]

The NI-VISA VIs work very well for this.

[crossrulz]

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@aderogba wrote:

Please is there a way to monitor RS232 communication traffic via VI? 

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Put a VISA Read inside of a loop.  You will likely need to setup the port before the loop to make sure you have the right baud rate and other settings.  Look in the LabVIEW Example Finder (Help->Find Examples) for Simple Serial.vi for a decent place to start.

[aderogba]

What I am really looking for is somehting that works similiar to hardware loop back. Using only software, I need to be able to monitor what is being sent out as well as what is being received. Thanks.

[RTSLVU · Accepted solution]

Ot sounds like you want to "see" what the serial port is doing while another program is using the port like a port sniffer?

If so LabView will not do that as LabView and Ni-VISA must have access to the serial port.

If another program is using the port NI-VISA and LabView will be locked out.

If you start a LabView porgram first NI-VISA will lock the port so no other program can access it.

I believe you need a program like PortMon part of the Sysinternals Suite from MS Technet.

[SnowMule]

Or NI IO Trace (NI-Spy), which is probably already installed on the machine...

http://www.ni.com/download/ni-io-trace-3.1.1/4285/en/  if it's not.