I am using HP34401a.lib, which is coming with LabVIEW distribution CD, to control HP34401a multimeter. If I choose GPIB, it works fine, but if I choose serial port to control the meter, then I got the following error message:
Error-1073807246 occured at OLD VISA Open in HP34401A Initialize.vi -> HP34401A Getting Started.vi
Possible reasons:
VISA:(Hex oxBFFF0072) The resource is valid, but VISA cannot currently access it.
In another occasion I also got the following error message:
Error-1073807331 occured at Property Node (arg 9) in HP34401A Initialize.vi -> HP34401A Getting Started.vi
I don't know what I should do to correct those errors. Any suggestion is highly
appreciated. The serial port and cable has been tested with Loopback.vi, it works O.K.