Functional difference between VISA resource name ASRL1::INSTR and COM1

Config: LabVIEW 6.02, VISA 2.6.0
I have used a text constant for "VISA Configure Serial Port.vi" for years, and just now I have run into problems.
With my application, a text constant of ASRL2::INSTR would properly open the port, but it would not send any data, but using COM2 worked.
What is the difference?

MAX sets up serial port aliases automatically when possible. Let me try to explain.
If the alias "COMx" was not previously configured in NI-VISA, and you have a serial port really named "COMx", and that VISA resource string does not have any other user-configured alias, then MAX will bind that alias to that port, regardless of what the full VISA resource string is. That part actually makes sense and shouldn't confuse anyone. If the alias "COMx" is taken, or the user has manually configured a different alias for the serial port (such as "MyDMM", for example), then MAX does not auto-assign the alias for that port. So far so good.
The confusing part in many cases is how NI-VISA itself assigns the VISA resource string. For COM3, normall
y NI-VISA would assign ASRL3::INSTR, and so on. There is 1 conflict that usually screws everything up. Since NI-VISA on Win32 allows you to open the parallel port by default as ASRL10::INSTR (for extremely historical reasons), the conflict occurs when you really have a COM10. It's not a terrible conflict, but it is confusing. NI-VISA will match every other port that it possibly can, and then just assign a unique resource name (ASRLx::INSTR) for COM10.
I am not sure why in your case NI-VISA didn't match COM3 to ASRL3::INSTR. If you want to do some experimenting, try this. Go into MAX, delete all your VISA aliases, delete LPT1 from the tree, exit MAX, restart MAX, and refresh. See if that cleared it up.
Dan Mondrik
Senior Software Engineer, NI-VISA
National Instruments

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Attachments:
VISA INSTR.JPG ‏12 KB

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