Experimental Physics and
Industrial Control System

Michael Davidsaver <[email protected]> · Tue, 8 Mar 2016 00:32:18 -0500

On 03/07/2016 11:25 PM, Ryan Pierce wrote:
> Ideally, I'd like it to be returned as an array of type stringin. But I don't know if such a thing exists in EPICS,

It does (waveformRecord w/ FTVL=STRING), but this isn't often used.  So cs-studio may not be able to do much with this, though I haven't tried.

> or if it does, how to pass it through asyn.

A quick look at devAsynOctet.dbd makes me think no.

> I can't return it as a single space or comma delineated string either, since I exceed the 40 character limit with 3 devices.

A string longer than 40 characters can be represented as a character array (waveform w/ FTVL=CHAR).  This is common and all OPI clients have some way to hint that this should be rendered as a string (cs-studio has a property Format=String).  You still have to pick a max length (NELM field), but this can be quite long.

> I considered trying to pass these in binary form and convert it as hex for operator display, but I don't know if a 64 bit datatype exists.

Unfortunately no 64 bit integers for Channel Access.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System