Experimental Physics and
Industrial Control System

bohmm <[email protected]> · Tue, 14 Apr 2015 11:07:29 +0100

Hello,

 I am an EPICS newbie and trying to implement statistics functions for

our energy meter. Our laser system is running at 10 Hz and the energy

meter has to catch every pulse energy/power value for the statistics to

be computed properly. So the energy meter is running with an external

trigger. I am communicating with the device via StreamDevice using

serial commands.

 The device supports two acquisition modes: Polling ("Free running") and

I/O interrupt (device is generating interrupts).

The problem is, once I get into I/O Interrupt mode @ 10 Hz, the device

is so busy receiving the data, that any other byte streams send to it

via StreamDevice do not get through. The consequences are that I am not

able to send the command to end the I/O Interrupt mode once I started it

and get back to Polling ("free running"), and also that the devices does

not receive its other statuses.

At really low repetition rates (@ 0.5 Hz) this problem does not occur,

the device has "time to answer".

Did anybody deal with a similar problem? Is it possible to solve without

writing a driver?

Best regards

Marek Böhm