Synchronizing external changes to target instrument with EPICS

["Wang, Andrew via Tech-talk" <tech-talk at aps.anl.gov>]

Hi all,

 

Long story short, we have an instrument that we wrote EPICS drivers for. The instrument in question also has a webpage, where all its settings are accessible. The goal is for the EPICS drivers to be updated when a modification is made to the webpage.

 

Suppose we have a setting on the instrument that allows us to adjust its voltage output. The EPICS drivers would contain a “getter” and “setter” record of the following.

 

record(ao, “voltage_set”)

{

                field(DTYP, “stream”)

                field(OUT,  “@commands.proto setVoltage 4000”)

}

 

record(ai, “voltage_get”)

{

                field(DTYP, “stream”)

                field(INP,  “@commands.proto getVoltage 4000”)

}

 

If I adjusted the voltage through the webpage, then I would also like the updated voltage to show up in “voltage_set”, like what is done through the @init protocol during initialization. I was thinking of doing this via “streamReload” in a subroutine record, which gets processed every ~5 seconds or so. Is that a viable solution or is there a better way of going about it?

 

Thank you,

Andy

 

Purple ribbon awareness