Re: GPIB remote control

[Maren Purves via Tech-talk <tech-talk at aps.anl.gov>]

Interesting - thanks, Mark.

(We here tend to always get serial line things working on console switches or terminal servers first - unless they need configuration from Windows interfaces before that)

Maren

On Thu, Nov 5, 2020 at 10:48 AM Mark Rivers <rivers at cars.uchicago.edu> wrote:

No it does not work if I telnet in.  But neither does the Keithley on the first port of the Moxa, but the Keithley is working with EPICS.  So I am not sure telnet is a good test?

 

Mark

 

 

From: Maren Purves <m.purves at eaobservatory.org>
Sent: Thursday, November 5, 2020 1:22 PM
To: Mark Rivers <rivers at cars.uchicago.edu>
Cc: tech-talk at aps.anl.gov
Subject: Re: GPIB remote control

 

Does it work if you log directly into the Moxa port (e.g. telnet)?

 

Maren Purves

East Asian Observatory/JCMT

 

On Thu, Nov 5, 2020 at 9:11 AM Mark Rivers via Tech-talk <tech-talk at aps.anl.gov> wrote:

I have an HP GPIB power supply I want to control remotely.  It was previously connected to an RS-232 to GPIB converter connected locally to a Windows PC, and that worked.  I want to use Ethernet instead of a local serial port, and to use Linux rather than Windows.  So I added a Moxa terminal server in place of the local PC serial port.  So the configuration is


Ethernet -> Moxa -> RS-232 -> RS-232/GPIB converter -> GPIB -> Power supply


This is not working.  I send commands and I don't get a response.  The notes on the RS-232/GPIB converter says it needs full flow control.  My startup script has these commands to talk to the Moxa:


drvAsynIPPortConfigure("serial2", "gsets11:4002 COM", 0, 0, 0)
asynSetOption(serial2,0,baud,19200)
asynSetOption(serial2,0,bits,8)
asynSetOption(serial2,0,stop,1)
asynSetOption(serial2,0,parity,none)
asynSetOption(serial2,0,crtscts,Y)


Any idea why this would not work, when it did work with a local serial port?


An inexpensive alternative would be an Ethernet to GPIB controller, such as this one from Prologix for $180.


http://prologix.biz/gpib-ethernet-controller.html


Does anyone have experience with these.


I have experience with the Agilent LAN/GPIB gateway, but those are expensive and appear to no longer be available.


Thanks,

Mark