[time-nuts] A Prologix GPIB-USB hint
didier at cox.net
Sat Jun 9 11:01:59 EDT 2007
This has been fixed in the most recent release. Abdul added a ++read command
that gets a single reading and then turns TALK off the instrument.
I have not actually tried it, but I have received it from Abdul a week or 2
The firmware isd easy to upgrade.
Give him a call.
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Saturday, June 09, 2007 9:32 AM
To: time-nuts at febo.com
Cc: sales at prologix.biz
Subject: [time-nuts] A Prologix GPIB-USB hint
I spent the better part of an afternoon trying to figure this bit out, so to
save somebody else the time:
Some GPIB instruments will complain if addressed to talk when they have not
been asked about anything. The HP6626A Power Supply is my present instance.
The Prologix GPIB-USB has the "++auto" command which controls if it should
automatically go into listen after a talk, the description on the manual
Enable (1) or disable (0) "listen-after-talk" feature
Based on that description, one would, or at least I would, expect the
behaviour to be that nothing happens until the next write, so that this
But that is not the case. "++auto 1" puts the device in talk mode
immediately, so the sequence needs to be:
You've been warned :-)
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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