Assigning VXI IRQ using GPIB/VXI-C controller.

I am updating an older system to more robust COTS configuration and need to assign a different IRQ to each Cubic VXI Rx'r in the chassis. This was done automatically with my old controller (NI pc870) but with the replacment GPIB/VXI-C all instruments come up on IRQ7.
I have experimented with the NVConfig and only managed to get all Rx'rs to come up on IRQ6.
My goal is use the GPIB as a dumb (completely unconnected) VXI controller to simply boot and arbitrate the the BUS. I have an embedded VME board to service the interrupts.

Hello Dalu,
In the past, National Instruments only officially supported a few Code Instruments, which are documented in Appendix B of the GPIB-VXI/C User Manual, but I did not see the VX4240 in the Appendix.
NI officially discontinued support for code instruments on the GPIB-VXI/C about 6 years ago, so you might want to consider moving to a newer VXI controller to access your device. You can find more information on our VXI-MXI-2, VXI-MXI-3, and VXI-1394 remote controller options here.
Regards,
Joshua Hernstrom
PXI/VXI Product Support Engineer
National Instruments

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I am confused about something. Are you saying that if you use something like GPIB0::address::INSTR, communication works just fine but the exact same command with an alias does not work? If that's the case, there is nothing wrong with the GPIB controller. If that is not what you mean, then what does it mean when you say 'it only the instrument descriptor'? Another test of the gPIB controller is to use MAX to communicate with the instrument. Do not select VISA for communication. Just right click on it in MAX. This does not use VISA at all and if it works, then the controller and software are just fine.

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HI,
HPIB and GPIB are the same thing at a low level in terms of instrument communication. They are both compliant with the IEEE 488.2 standard.
The difference is the driver you have to use. Each manuafacturer has to develop a driver to control the interface ont he host. For National Instruments interfaces you use NI-488.2 (which you refer to GPIB functions). For HP interfaces you need to use the SICL library. For information using this library in Visual Basic you'll have to look at the SICL documentation.
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nareshannam wrote:
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Assigning VXI IRQ using GPIB/VXI-C controller​.

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Assigning VXI IRQ using GPIB/VXI-C controller.