RE: GPIB replies lost?

[Mark Rivers via Tech-talk <tech-talk@aps.anl.gov>]

Have you enabled asynTraceIODriver in the VXI11 driver to see if there is any reply?  Could it be a terminator problem, though GPIB does not normally use terminators.


-----Original Message-----
From: tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> On Behalf Of Michael Davidsaver via Tech-talk
Sent: Friday, April 19, 2019 4:58 PM
To: Eric Norum <wenorum@lbl.gov>
Cc: EPICS Tech-Talk <tech-talk@aps.anl.gov>
Subject: Re: GPIB replies lost?

"ID?" isn't a typo.  The 3458A DMM doesn't quite follow the usual conventions.

I have tried "*IDN?", which the device tells me (via its front panel) is an error.


On 4/19/19 1:33 PM, Eric Norum wrote:
> My reply about a typo contained a typo.  The SCPI command in question is “*IDN?”.
> 
>> On Apr 19, 2019, at 1:06 PM, Michael Davidsaver via Tech-talk <tech-talk@aps.anl.gov> wrote:
>>
>> All,
>>
>> I've come across a new (to me) oddity involving GPIB communication 
>> between a Keysight/Agilent E5810A GPIB to ethernet bridge, and a 
>> Keysight/Agilent/HP 3458A DMM.  I'm contacting Keysight support, but 
>> thought I'd see if someone had already run across this issue.
>>
>>
>> It appears that the DMM is receiving commands which I send.
>> "BEEP" makes the DMM beep.  If I send an invalid command I can read 
>> the error message through its front panel.
>> However, valid commands which should send a reply (eg. "ID?") don't 
>> trigger an error, but also timeout without sending back any reply string.
>>
>> I see the same behavior with a second 3458A.  Also when sending 
>> commands directly through the embedded web server in the E5810A or a python vx11 client.
>>
>> I tried two different GPIB devices (Keithley and Datron DMMs) with 
>> the same E5810A and cable.  Both send back replies and otherwise behave as I expect.
>>
>>
>> Thanks,
>> Michael
>>
>>
>> Also, a random fact for Friday.  I was on a flight from JFK to LHR 
>> which was listed as 3458 miles.
>