Experimental Physics and
Industrial Control System

Ben Franksen via Tech-talk <tech-talk at aps.anl.gov> · Fri, 3 Apr 2020 17:28:20 +0200

Am 03.04.20 um 16:25 schrieb Ralph Lange via Tech-talk:
> On Fri, 3 Apr 2020 at 15:04, Ben Franksen via Tech-talk <
> tech-talk at aps.anl.gov> wrote:
> 
>> [...]
> 
> You could also try to use another
>> record with NELM=NORD=0 and that has an output link that you point to
>> your WAVE record. There is no record type in base with such an output
>> link [...]
>>
> 
> The aaoRecord since Base 3.12.2 (ca. 1995)

Thanks I completely forgot about this one. Indeed this works:

record(waveform, "wf") {
    field(NELM, "10")
    field(FTVL, "DOUBLE")
    field(INP, [1, 2, 3, 4, 5, 6, 7, 8])
    field(PINI, "YES")
}
record(aao, "reset") {
    field(NELM, "0")
    field(OUT, "wf PP")
}

ben@juliana[1]:.../base/7.0>caget wf
wf 10 1 2 3 4 5 6 7 8 0 0
ben@juliana[1]:.../base/7.0>caget wf.NORD
wf.NORD                        8
ben@juliana[1]:.../base/7.0>caput reset.PROC 1
Old : reset.PROC                     0
New : reset.PROC                     1
ben@juliana[1]:.../base/7.0>caget wf.NORD
wf.NORD                        0
ben@juliana[1]:.../base/7.0>caget wf
wf 10 2.50321e-308 0 0 0 0 0 0 0 0 0

The last response is unexpected though. While caget -h indeed says:

Arrays: Value format: print number of requested values, then list of values

printing the actual number of values in the response (and only so many
values) would be more useful. Does CA not return the current number of
values in an array?

Cheers
Ben
-- 
...it is impossible to speak of a depoliticized economy as the liberals
do, or of a separation between economic exploitation and political
oppression as the Marxists articulate. The basic distinction, rather, is
between power and creativity...
             -- Jonathan Nitzan and Shimshon Bichler: Capital as Power

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System