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Subject: Re: streamDevice I/O Intr polling rate
From: Dirk Zimoch <dirk.zimoch@psi.ch>
To: Dimitrios Tsifakis <Dimitrios.Tsifakis@anu.edu.au>
Cc: tech-talk@aps.anl.gov
Date: Wed, 02 Feb 2011 16:22:31 +0100
Dimitrios Tsifakis wrote:
Hello,

I am producing a protocol file for a home-made scaler and I am having a
problem. The scaler can be set up with a target count, then it can be
given a simple "Go" command to start counting. It will send a message to
the serial port when the required count target is reached. I am using an
I/O Intr SCAN record to search in the serial port data for that string.
It works for target counts that result in counting times of a second or
more. When the real counting time is less than a second, the reported
counting time is always more, usually around 1 second but at times a bit
less than that.
My question is, is there a way to increase the scan rate of the I/O Intr
record so that it detects the "target reached" string arriving on the
serial port quicker?

The counting times we expect are in the order of 300 ms. When I use
minicom to control the scaler directly, it sends the "target reached"
string as quickly as you would expect.

I am using base-3.14.12, asyn4-15 and StreamDevice-2-4, on linux.

Regards,
Dimitris


Yes, set the variable PollPeriod (in milli seconds). It defaults to the value of ReplyTimeout.


References:
streamDevice I/O Intr polling rate Dimitrios Tsifakis

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