topic Re: VISA resource name constant in LabVIEW

VISA resource name constant

bilgetea — Mon, 08 Oct 2001 22:35:53 GMT

Hello all,
I'm working with LabVIEW 6.0.2 on Windows 2000 service patch 2. I have
two machines - one a development workstation, the other a portable.
They are not the same machine, but both are fast pentiums running the
same OS and LabVIEW version as mentioned above.
When I insert a "VISA resource name constant" into the wiring diagram
on my development workstation, I can use the manipulation cursor (the
hand) to select COM1, COM2, or LPT1. If I do the same thing on the
portable computer, I get different choices - the visa resource names
ASRL1::INSTR, ASRL2::INSTR, and ASRL10::INSTR. Such constants created
on one machine and then exported to the other create errors, although
they work on the machine in which they were created.
Why is
this happening? Right-clicking on the constants, they have the
same properties; under "Select VISA Class" and then "I/O Session",
"Instr" is checked. Nothing else is checked except "Size to Text".
These properties are the same on each computer.

---------------------------
Dan Greenspan
Mail Stop 14-707M
Johns Hopkins University
Applied Physics Laboratory
11100 Johns Hopkins Road
Laurel, MD 20723-6099

240-228-7490
daniel.greenspan@jhuapl.edu
---------------------------

Re: VISA resource name constant

C.D. — Tue, 09 Oct 2001 10:47:38 GMT

Hello,

"ASRL1::INSTR" is the resource name and "COM1" is the alias of one and the same resource.

Probably no aliases are defined on your portable computer. Launch the Measurement & Automation Explorer and choose menu Tools->NI VISA->Alias Editor (I hope thats the right translation, because I use the german version). Here you can define an alias for every VISA-resource. These alias-names will then shown on your "VISA resource name constant".

Re: VISA resource name constant

RayFarmer — Tue, 09 Oct 2001 10:52:01 GMT

Hi,

My guess is, on the development workstation, some aliases have been setup for those Visa Resources, eg COM1 is an alias for ASRL1::INSTR.
If you look in Measurement and Automation Explorer under Devices, you can tell if this is the cases.

Regards
Ray Farmer