Re: HPIB bus commands

From: Larry Mollica (
Date: 2004-04-14 17:46:10

Quoting Marko Mäkelä <>:
> On Tue, Apr 13, 2004 at 12:01:31PM -0700, Larry Mollica wrote:
> > I don't have the HP manuals handy right now. The instruments we are working
> > with are HP RF gear, like signal generators and spectrum analyzers. There
> > seems to be some bus commands common to all of the HP RF gear I've seen so
> > far, the one I recall is ASCII "?"
> That would be 0x3f, or UNLISTEN.  There's a special ROM entry for sending
> that
> command.

Ok, so that's not something exclusive to HP instruments as I assumed. Is that
regularly sent by the PET, maybe when a IEEE488 file is CLOSEd in basic?

If that is already being sent by CLOSE or whatever, then it just doesn't do
anything visible to the instrument. I was expecting it would release the
instrument from 'remote' status, but it may be it requires the specific command
to release the front panel.

In any case, I still need to work out a way to send specific bus commands to the

Thank you for the info

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