Experimental Physics and
Industrial Control System

Dirk Zimoch <[email protected]> · Tue, 13 Mar 2018 16:43:22 +0100

Hi Abdalla,

In most cases ExtraInput = Ignore does more bad than good because it

switches off part of the input checking.

If you get wrong inputs (e.g. "Running" instead of a number) this almost

always related to protocols that do not consume all input that a command

produces.

If for example a command sends a long, maybe multi-line string and you

only parse the beginning until you find an "interesting" value, the

remainder of the string is still somewhere.

StreamDevice tries to discard such "old input" at the beginning of every

'out' command, but it is a race condition. If the device sends more

input as a result of the previous command after the flush, it will be

received instead of the real reply of the next command. This is also

true for replies on set commands. If the device sends a reply after your

sent a set command, you should read it and not "fire and forget" the set

value. Otherwise the replay may mix with the data of the next command.

Thus first you should remove all the ExtraInput = Ignore.

Then find out which command replies something with "Running" which you

may not have read. Try to connect with telnet and type the commands

manually. In the protocol consume *everything* the device sends back.

For more details I need to know more about the device and what commands

it knows. If possible send a link to the manual. Also your full protocol

file would be helpful.

Dirk

On 11.03.2018 13:54, Abdalla  Ahmad wrote:

Hi

We have the Gamma QPC ion-pump controllers controlled via StreamDevice

through telnet, port 23. We have 4 parameters implemented, pressure,

voltage, current, and channel status. The problem is that the IOC gives

an error that the value received for the pressure PV is "Running", i.e.

"Input Running does not match format %E". Seems like at some point the

controller is not finishing a previous parameter and the IOC receives

something different than the current parameter requested.

We have the following in the protocol file:

OutTerminator = CR;

InTerminator = CR;

ReadTimeout = 2000;

ReplyTimeout = 2000;

And each parameter in the protocol file has ExtraInput = Ignore at the

end. Any help resolving this mismatching issue?

Best Regards,

Abdalla Ahmad

Control Engineer

SESAME

Allan, Jordan.

Tel: (+962-5) 3511348 , ext. 265

Fax: (+962-5) 3511423

Mob: (+962-7)88183296

www.sesame.org.jo <http://www.sesame.org.jo/>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System