Error 28 Using GPIB Send command

[ate_uf]

Hi,

I am trying to program HP/Agilent 8970A Noise Figure Meter. The instrument has HPIB interface. I am able to send commands to the instrument using 488.2 communicator invoked using MAX. How should I communicate with the instrument from within LabVIEW?

I tried using 488.2 Send command to communicate with the instrument, it gives me error 28 (NULL Menu). Please let me know what I could be doing wrongly. I tried GPIB write and VISA but nothing seems to work as of now.

Regards,

Harry

[Dennis_Knutson]

I prefer to use VISA for all communication. Drop a VISA Write on the diagram. Move the mouse over the VISA Resource Name terminal, right click, and select Create Control. Do the same thing with the Write Buffer terminal. On the front panel, click the lttle down arrow on the VISA Resource Name control. You instrument should be listed. Somehting like GPIB0::x::INSTR where x is the address of the instrument. Enter a command to send and run the VI. I have no idea what that 488.2 error means. I'm more familiar with VISA errors. If you do get an error using VISA, what is it?