Re: lso record

[Rolf Keitel via Tech-talk <tech-talk at aps.anl.gov>]

Title: signature text

On 2024-09-09 8:44 a.m., Heinz Junkes via Tech-talk wrote:

> Good evening,
>
> I have a problem with the lso (long string out) record.
>
> When I use it as a replacement for stringout (limited to 41 char), 
>
> according to the Record reference Manual : "To initialize a string output record it is simplest to set the VAL field directly"
>
> record(lso, "$(user):zone0")
> {
>     field(VAL, 'blabberblabberblub')
> }
>
>
> I get the following message:
>
>
> dbLoadRecords "db/tempLinuxExample.db", "user=ares"
> Can't set "ares:zone0.VAL" to "blabberblabberblub"  : Bad Field value
> ERROR:  at or before ')' in file "db/tempLinuxExample.db" line 7
>
>  7 |     field(VAL, 'blabberblabberblub')
>
> ERROR failed to load 'db/tempLinuxExample.db’
>
> We then tried the contradictory definitions of the description: 
> "DOL can also be a constant instead of a link, in which case VAL is initialized to the constant value.”
>
> record(lso, "$(user):zone0")
> {
>     field(DOL, 'blabberblabberblub')
> }
>
>
> epics@ares:~$ caget -s ares:zone0.VAL$
> ares:zone0.VAL$ 41 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>
> But I don't quite understand this:
>
> "The first field that determines where the desired output originates is the output mode select (OMSL) field, which can have two possible values: closed_loop or supervisory. If closed_loop is specified, the VAL field's value is fetched from the address specified in the Desired Output Link field (DOL) which can be either a database link or a channel access link. If supervisory is specified, DOL is ignored, “
>
> record(lso, "$(user):zone0")
> {
>     field(OMSL, "closed_loop")
>     field(DOL, 'blabberblabberblub')
> }
>
> The same output :
>
> epics@ares:~$ caget -s ares:zone0.VAL$
> ares:zone0.VAL$ 41 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>
>
>
> Danke Heinz
>
>

--
Rolf Keitel, Ph.D.
Researcher Emeritus
e-mail: rolf at triumf.ca
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