EPICS Controls Argonne National Laboratory

Experimental Physics and
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<== Date ==> <== Thread ==>

Subject: Re: Knob boxes
From: Eric Norum <[email protected]>
To: "Rarback, Harvey" <[email protected]>
Cc: "'[email protected]'" <[email protected]>
Date: Tue, 24 Sep 2002 07:48:56 -0600
I designed the knob boxes now in use at the CLS so I can provide some information about them.

The knob boxes were in use at the Saskatchewan Accelerator Laboratory before the CLS project began. Each box contained four shaft encoders (2000 steps/revolution), an 8x40 plasma display, and an Intel 8051-family microprocessor which monitored the encoders and sent the data to the control system microVAX over an RS-232 serial line. There were also a couple of 'toggle' boxes with 4 center-off momentary-action toggle switches in place of the shaft encoders.

The knob boxes were incorporated into the CLS EPICS control system by connecting the serial lines from the knob boxes to one of the MC68360 embedded IOCs developed at the CLS. The MC68360 embedded IOC has four unassigned serial I/O ports so we could have up to 16 knobs on one embedded IOC.
Glen Wright at the CLS has written a very nice knob server program to couple the EPICS records in the embedded IOC to the desired target EPICS PVs.


--
Eric Norum <[email protected]>
Department of Electrical Engineering
University of Saskatchewan
Saskatoon, Canada.
Phone: (306) 966-5394   FAX:   (306) 966-5407


Replies:
Re: Knob boxes Glen Wright
References:
Knob boxes Rarback, Harvey

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