Thank you all for your valuable replies. Effectively for some unknown reason, the visa driver wasn't properly installed on my PC
Thanks again G�rard -- G�rard F�rini Switzerland http://home.tiscalinet.ch/gferini "JoshuaP" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > The first thing that I would suggest is to make sure you have the > latest VISA driver. Make sure you get the full version. > > http://digital.ni.com/softlib.nsf/websearch/8E7D54CA3A1FDECF86256E4D007ED2E0?opendocument&node=132070_US > > Then open up LabVIEW and run the Serial Communication.vi shipping > example that can be found in the example finder. Connect pins 2 and 3 > together on your serial port. Then run the example. You should be > able to see the data being read back. If not, open the block diagram > and set the handshaking so that it is set to none. > > Another good utility is portmon. You can use it and compare what > windows is seeing across the serial port. It's very useful and it > allows you to monitor the serial calls when hyper terminal or LabVIEW > is running and then compare the differences. > > http://www.sysinternals.com/ntw2k/freeware/portmon.shtml > > If the program still doesn't work you might want to create a service > request and call in. It's possible your serial port doesn't support > the standard serial features that VISA tries to configure. For > example if you serial port does not support handshaking and you try to > set the handshaking to none it could cause problems, because the port > will not understand the handshaking attribute or the setting of none. > > I hope this helps out. > > JoshuaP > National Instruments
