Experimental Physics and
Industrial Control System

Hello tech talkers,

1. I am trying to add the following functionality in my stream device x-ray apps:

Basically I want to kill the x-ray flux based on a timer (an auto shut off timer) if the x-ray is continuously firing upto the set time. I want to give the end user, the ability to set this time.

Currently the way I do this is using a sequencer code (see attached file), But I think it is better to use the countdownTimer records provided in stdApp. So I decided to test it out. The problem I encountered is that when I set the trigger PV  to the xray on/off record ($(P):ON), at the end of the countdown, the xray does not turn on or off. So as another test I tried to trigger the sim detector acquire PV (from area detector) using the countdownTimer records, and this worked. Looking at the record types, I see that the acquire PV for sim detector is a busy record. Now when I change the xray on/off to a busy record instead of bo, I get this error:

2. I have the following records in my records instance file (.db), Basically I get the kVp and power from the device and use it to calculate the tube current. Now when both the kVp and power rbv's are 0 (so 0/0), I would like to show the current as 0 (or NAN) to the end user. How do I do this in the database file.