Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Mon, 14 May 2007 18:03:31 -0500

How are your "read" records being processed.  Is each processing at 1Hz, or is it a set of records linked with FNKL links, with only the first record scanning at 1Hz.

  If it they were linked then it seems to me that the "set" messages would have to wait for at most one "read" request to process before they went to the head of the queue (since there should be at most 1 read request in the queue.  But without testing it I can't be sure.

Mark

________________________________

From: Robert Emery [mailto:[email protected]]
Sent: Mon 5/14/2007 5:26 PM
To: [email protected]
Subject: Asyn Delay

I am using ASYN to communicate with 12 power supplies via an E5810
Ethernet/GPIB gateway from a Linux IOC.  I am periodically (1 sec)
reading 24 parameters from the supplies (voltage and current for each
supply) and am setting the current (3 supplies at a time) when the
operator turns a dial at the console.  The problem that I am having is
that when the current/voltage requests are processed I see about a 1 s
delay in the response to the current set messages.

It takes the power supplies about 50 ms to respond to a request for
current or voltage information.  If these requests are backing up in the
ASYN port queue, I would make sense that I would see this type of delay.

Can I speed up the processing of my current set messages by setting up a
second ASYN port on the same IOC connected to the same gateway?  With a
higher priority?  Or is there a better way to speed up my set messages?

Thanks
Rob Emery
UW Medical Center

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System