Experimental Physics and
Industrial Control System

[email protected] · Fri, 25 Feb 2011 22:37:16 +0100

Am Freitag 25 Februar 2011, um 15:01:32 schrieben Sie:
> Now, I have to bring up a problem I'm facing on pvPut.
>
> The attached files are a simple .stt program that repeatedly puts
> a value into a PV, and a .db file including the PV (a soft longout
> record with its all fields initialized with their default values).
>
> If the .stt progrm runs on an IOC where the soft record resides,
> it works just fine for all of the following three cases:
>
> 1. pvPut(var)
> 2. pvPut(var, SYNC)
> 3. pvPut(var, ASYNC).
>
> However, if the .stt program runs on an IOC to put a value into
> the soft record placed on another IOC, only pvPut(var) works fine.
>
> pvPut(var, SYNC) and pvPut(var, ASYNC) behave strangely. It's very
> hard to explain in short sentences since it varies from case to
> case.
>
> For example, the value actually put into the record is shortened
> to a multiple of 256 that is mostly close to the value the .stt
> program tried to put... or ... always zero...
>
> At any rate, pvPut(var, SYNC) and pvPut(var, ASYNC) shows exactly
> the same strange befavior in the situation.
>
> I found that "caput -c" also does not work in that situation. So,
> I guess this problem might be related with Channel Access as the
> underlying message system.

At first I wanted to suggest you check with the latest stable sequencer version
(2.0.12) but this now really looks like CA (or your setup of it) is at fault.
The fact that you have the -c option for caput means the client side uses
EPICS base 3.14.12, right? What EPICS version runs on the IOC?

Values shortened to a multiple of 256, this sounds like a byte order problem.
Knowing the exact type and version of the OS used on both client and server
side might help to solve this.

Cheers
Ben

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System