Experimental Physics and
Industrial Control System

Kevin Peterson <[email protected]> · Fri, 18 Nov 2011 11:18:42 -0600

Andrew,

The MPST setting I needed was "Always".

Kevin

On 11/18/11 10:41 AM, Andrew Johnson wrote:
> Hi Kevin,
> 
> On 2011-11-17 you wrote:
>> I'm using a stringout record and I noticed that it only writes the
>> string to the PV specified in the OUT field when the string changes.  I
>> was hoping to change this.  I took a look at the stringout fields and
>> noticed two fields that are set to "On Change":
> 
> Looking at the source code the record does call the device support's write 
> routine every time it processes.  Your dbpr output which I snipped showed that 
> you're using Soft Channel device support but the OUT field is empty, so it's 
> not actually writing the string value anywhere.  However it looks like you 
> don't really need it to, and you're really asking about it posting channel 
> access monitors instead...
> 
>> Unfortunately I can't find documentation for the APST and MPST fields.
>> I've searched tech-talk, as well as this page (and fields common to all
>> & many record types):
>>
>> http://www.aps.anl.gov/epics/wiki/index.php/RRM_3-14_String_Output
>>
>> Is there a record documentation location I've missed?  What do the APST
>> and MPST fields do?
> 
> They control when the record posts CA monitors (MPST => value monitors, APST 
> => archive monitors) on the VAL field.  For your needs I think you just want 
> to set the MPST field to "Every time" (or whatever the choice string actually 
> is).
> 
> The APST and MPST fields exist in the aai, aao, stringin and waveform records 
> too, but it looks like you're right that no documentation exists to describe 
> them.  I'm copying this reply to tech-talk in the hope that someone who has a 
> wiki account will be willing to add something about them to the 
> http://www.aps.anl.gov/epics/wiki/index.php/RRM_3-14_Common "Fields common to 
> many record types" and to the pages for those 5 record types.
> 
> - Andrew

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System