visa alias not working

[Goomba79]

Hello!

For some reason my alias for my TTi PL303QMD-P no longer works.

the PSU is connected to my PC via USB and is listed as a COM port (COM34).

If I remove the alias and select ASRL34::INSTR in the resource name field I can communicate and control the PSU.

If i try with the alias "PL303" it times out and gives Error -1073807360 occurred at PLP Initialize With Options.vi

Has anyone come accross anything similar and know how to resolve this?

It's driving me mad!

Thanks for looking,

Iain

[Hooovahh]

Sorry I can't help on this particular issue.  But in the past I never used resource aliases for COM ports.  I would either reference the COM port by number, which Windows shouldn't change but can in some strange circumstances.  Or I would query the available devices using the VISA Find Resource, then try communicating with each of them until I get the response I wanted.  This way there was no need to configure anything, it would just query all ports and try to find my device with some known command.

[PhillipBrooks]

Aliases can be viewed and modified using Measurement and Automation Explorer (NI-MAX).

Typically found in the National Instruments\MAX folder (NIMax.exe)

You can check if the alias is still assigned to asrl34, and if not change it.

http://digital.ni.com/public.nsf/allkb/AE830D99E30CB61486256C7900697999?OpenDocument

[Goomba79 · Accepted solution]

Hello!

Thanks everyone for your replies!

I managed to locate the error.

The Aliasing was corrct for the instrument however the IVI driver was pointing to the wrong port.

I corrected it here.....

IVI Drivers - Logical Names - PL303 - Go To 

From here I then selected the device and pointed the resoutce descriptor to the right place!

Thanks again