Instrument Control (GPIB, Serial, VISA, IVI)

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Error with NI 9871 (Serial RS485 interface)

Hello everybody.

 

I am having troubles with serial comunication with this RS485 module. I checked in MAX and the ports are present in the system, but when I open the VISA test panel appears this error: VISA:  (Hex 0xBFFF0072) The resource is valid, but VISA cannot currently access it.

The error appears even before the test interface, so I am unable to send commands.

 

Any guess?

 

Thank you!

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some other serial comm program is open?

greetings from the Netherlands
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