Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Tue, 22 Jan 2008 20:43:30 -0600

Those fields are definitely writeable from EPICS channel access.  Have you tested that?

I can't say that I've ever tried linking to them with database links, but I can't see why it would not work.

Mark

________________________________

From: [email protected] on behalf of Eric Williams
Sent: Tue 1/22/2008 7:40 PM
To: [email protected]
Subject: asynRecord immutable fields

I'm trying to drive a GPIB device with a genSub record through an
asynRecord, but I've been unable to change some of the asynRecord fields
that I need to perform all the necessary control functions.

In particular, I've been unable to modify TMOD or NOWT, which I've
linked to output fields of the genSub record.  (There are probably other
asynRecord fields that act similarly, but these are the ones I've run
into so far.)  Writing to AOUT works OK.

If I link my genSub record output fields instead to "normal" records
(eg: longout), then the values go through just fine.  But they never
show up when linked to the asynRecord fields.  In contrast, I'm able to
modify these fields through dbpf on the console.

I've looked at the DBD file, and I'm not able to find any reason why one
field would be writable and another isn't.  Anybody have a guess?
--
eric

Environment:

    linux-x86
    epics 3.14.9
    asyn 4-8
    genSub 4-6

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System