GPIB communication with oscilloscope

[Kaka_fsk]

Hello,

I am trying to communicate with oscilloscopes using GPIB. However, it seems there is something wrong. The NI MAX can find the instrument, but can't get correct response when it send command *IDN?. Everytime the oscilloscopes report query unterminated.

I also used IBIC with ibfind gpib0. it reported error. 

NI-488.2 guide verified the software and hardware installed successfully.

The oscilloscopes I tried are HP54645A and Agilent 54521D. I checked their manual that they support *IDN? command.

Can anyone help me find what's wrong? Do I need install other drivers besides the NI GPIB?

Thanks.

[Kaka_fsk]

Something to add: The GPIB I am using is PCMCIA-GPIB.

[Makoto]

It looks like a termination problem.  When you send a command string to the instrument, the string must:

 - terminate with an EOI signal, or

 - terminate with a termination character that the instrument wants

As for EOI, you must enable this option by using ibeot() function on NI-488.2.  ibdev() also has the same feature on its additional params. As for termination character, the command string must include as in its entity.  Actually most instruments that accept "*IDN?" will understand an LF (0x0A) as the terminator, therefore you can send "*IDN?\n" rather than "*IDN?".

このメッセージは　06-11-2007 10:41 AMに Makoto が編集しています。