Experimental Physics and
Industrial Control System

Check the EPICS Record Reference documentation for details on the binary output record. It has a field “HIGH” which specifies the time in seconds for the BO record to remain asserted before resetting itself to zero automatically. 

 

From: Feister, Scott <scott.feister at csuci.edu>
Sent: Friday, January 5, 2024 7:11 PM
To: Hartman, Steven <hartmansm at ornl.gov>
Cc: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: RE: [EXTERNAL] Representing stateless device commands?

Thanks Steven and Mark, for your welcoming and helpful responses.

 

I have the streamDevice proto files written, and am at the point where I’m wondering if there’s an easy way to capture what Steven is suggesting – forcing the PV back to zero immediately after the RS232 command “IncreaseBrightness” has been sent, such that the state of the binary PV “MYLED:IncreaseBrightness” represents whether we are “in process” of “Increasing Brightness”?

 

Here’s what I have in mind as far as sequence:

 

1. “MYLED:IncreaseBrightness” is 0, its regular state.
2. I invoke “caput MYLED:IncreaseBrightness 1”, changing the PV from 0 to 1.
3. StreamDevice follows its protocol for processing a change in the PV, and sends an RS232 message of “IncreaseBrightness” to the device. StreamDevice awaits no reply, as the device gives none.
4. [Somehow?] “MYLED:IncreaseBrightness” is now automatically forced back to 0.

 

I have steps 1-3 under control with StreamDevice, so I’m wondering about best practices to implement Step 4.

Thanks!

 

Scott