Experimental Physics and
Industrial Control System

Michael,

 

Thank you. Yes, there are two GPIB devices connected to that E5810. The other GPIB device, a DC calibrator, and its IOC are supposed to be offline during machine operation, but they were turned on during maintenance days and left on.

 

There is one record scanned at "2 second" in the DC calibrator IOC. I stopped the DC calibrator IOC. Now, the DMM HP3458A system is back to its previous "normal" state: it scans at "5 second" to read a floating point number without any problem (again, I have never made this system work faster although I tried all kinds of commands/settings).  

 

Indeed, it only takes a few milli-second to get a reply for the command “ID?”. See below.

So, the problem seems related to the DMM itself (specifically related to the data acquisition & readout) rather than the E5810 & the network.  

 

2020/07/17 09:11:25.614 L0 addr 6 queueRequest priority 0 not lockHolder

……

2020/07/17 09:11:25.614 L0 6 vxiWrite numchars 4

2020/07/17 09:11:25.616 L0 6 vxiWrite

ID?

ID?\n

49 44 3f 0a

2020/07/17 09:11:25.616 L0 addr 6 queueRequest priority 0 from lockHolder

2020/07/17 09:11:25.616 L0 schedule queueRequest timeout

2020/07/17 09:11:25.616 asynManager::portThread port=L0 callback

2020/07/17 09:11:25.616 L0 vxiSetEos 1

\n

0a

2020/07/17 09:11:25.618 L0 6 vxiRead

HP3458A

HP3458A\r\n

48 50 33 34 35 38 41 0d 0a

2020/07/17 09:11:25.618 L0 vxiSetEos 0

 

 

On 7/14/20, 10:42 AM, "Michael Davidsaver" <mdavidsaver at gmail.com> wrote:

 

    Yong,

 

    As a test, have you tried sending commands through the embedded

    web server in the E5810?

 

    When timing reply latency, it would be interesting to

    compare with a command which should be quick, like "ID?".

 

    If I recall correctly, it is also possible to

    send vxi11 commands to the E5810 itself.  I believe

    it responds to "*IDN?".  This removes the DMM

    completely from the loop.  Unless this is also slow,

    I wouldn't suspect the network.

 

    Also, since I should have asked previously.  Is the

    DMM the only GPIB device connected to this E5810?