Experimental Physics and
Industrial Control System

Andrew,

At SLAC we have some 4 knob panels originally installed 20 years ago for our legacy system. The guts were upgraded a decade ago by Miranova (don't know if they are still in business) to use RS-485 links. 

We are in the planning stages of moving our old PC-based knob control to a COSYLAB microIOC with RS485 support. In our case this will have to continue to work with the legacy system while providing a straight EPICS implementation as well.

We also looked at the SUNDIALS years ago; our operations crew rejected them, since they felt different. Our knobs feel heavier than the SUNDIALS.

Ron Chestnut

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Duggan, AJ (Andrew)
Sent: Wednesday, June 20, 2007 8:31 AM
To: [email protected]
Subject: Control knob interface query

Hello all,


I'm working on the design of a small EPICS 3.14 system running on a Linux PC.
Data comes from a legacy system via a custom-designed USB interface (being done in-house)

One key requirement is to have 8 control knobs.
Our current preferred idea is to provide a USB solution using this product:

http://www.phidgets.com/index.php?module=pncommerce&func=itemview&KID=1181719107148.79.162.144&IID=119

A well-documented Linux API is included with the product.
We are planning to write a standalone application using this API and the EPICS Channel Access API to meet our requirement.

I've searched around for what's already been done in this area.
There's a Tech-Talk message back in Sept 06 about the knob control solution at APS - that involves a VME-based solution and making the EPICS database 'knob-aware.'
Other than that, and the original SunDials/KnobManager solution, I've not been able to find anything.

If anyone has done something similar already, I'd welcome any advice.


Regards,
Andy Duggan

Daresbury Laboratory,
MEIS Control System Upgrade Project
 

References:

Control knob interface query Duggan, AJ (Andrew)

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