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 page is:
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 would work:
++auto 0
idle bus
write something
device= listen
send data
idle bus
++auto 1
idle bus
write something
device= listen
send data
device= talk
read something
But that is not the case. "++auto 1" puts the device in talk
mode immediately, so the sequence needs to be:
++auto 0
idle bus
write something
device= listen
send data
idle bus
write something
device= listen
send data
idle bus
++auto 1
device= talk
read something
You've been warned :-)
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@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.
Poul,
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
ago.
The firmware isd easy to upgrade.
Give him a call.
Didier
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Saturday, June 09, 2007 9:32 AM
To: time-nuts@febo.com
Cc: sales@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
page is:
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
would work:
++auto 0
idle bus
write something
device= listen
send data
idle bus
++auto 1
idle bus
write something
device= listen
send data
device= talk
read something
But that is not the case. "++auto 1" puts the device in talk mode
immediately, so the sequence needs to be:
++auto 0
idle bus
write something
device= listen
send data
idle bus
write something
device= listen
send data
idle bus
++auto 1
device= talk
read something
You've been warned :-)
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@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.
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.472 / Virus Database: 269.8.13/842 - Release Date: 6/9/2007
10:46 AM
Thank you Paul for the hint! We shall add that to the help doc.
The upgrade that Didier mentioned will be ready for public release very soon
and will be posted on prologix.biz.
Regards,
Abdul
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Didier Juges
Sent: Saturday, June 09, 2007 8:02 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] A Prologix GPIB-USB hint
Poul,
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
ago.
The firmware isd easy to upgrade.
Give him a call.
Didier
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Saturday, June 09, 2007 9:32 AM
To: time-nuts@febo.com
Cc: sales@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
page is:
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
would work:
++auto 0
idle bus
write something
device= listen
send data
idle bus
++auto 1
idle bus
write something
device= listen
send data
device= talk
read something
But that is not the case. "++auto 1" puts the device in talk mode
immediately, so the sequence needs to be:
++auto 0
idle bus
write something
device= listen
send data
idle bus
write something
device= listen
send data
idle bus
++auto 1
device= talk
read something
You've been warned :-)
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@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.
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.472 / Virus Database: 269.8.13/842 - Release Date: 6/9/2007
10:46 AM
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts