Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	gateway enum writes
From:	"Leicester, PJ $Pete$" <[email protected]>
To:	<[email protected]>
Date:	Tue, 28 Mar 2006 17:53:20 +0100

Title: Message

I am getting some strange behaviour when writing enumerations through the Gateway (version 2.0.0.0 on 3.14.8.2 and RedHat Enterprise 4).

The problem first showed itself in edm when pressing a button on a edm screen to send the value resulted in the following error:

    CA.Client.Exception...............................................
        Warning: "Virtual circuit unresponsive"
        Context: "diamrs0005l.diamond.ac.uk:6064"
        Source File: ../tcpiiu.cpp line 896
        Current Time: Tue Mar 28 2006 16:19:01.334736000
    ..................................................................

I did some further tests using caput with similar results:

    [pjl45@pc0005 pjl45]$ caput -w15 GDA:scaler2.CNT Count
    Old : GDA:scaler2.CNT                Done
    Read operation timed out: PV data was not read.
    New : GDA:scaler2.CNT
    CA.Client.Exception...............................................
        Warning: "Virtual circuit disconnect"
        Context: "op=0, channel=GDA:scaler2.CNT, type=DBR_TIME_STRING, count=1, ctx="diamrs0005l.diamond.ac.uk:6064""
        Source File: ../getCopy.cpp line 82
        Current Time: Tue Mar 28 2006 17:04:24.488496000
.

Despite the above error message the write does actually reach the IOC.

However if I now try the change the value back as follows:

    [pjl45@pc0005 pjl45]$ caput -w15 GDA:scaler2.CNT Done
    Old : GDA:scaler2.CNT                Count
    Read operation timed out: PV data was not read.
    New : GDA:scaler2.CNT
    CA.Client.Exception...............................................
        Warning: "Virtual circuit disconnect"
        Context: "op=0, channel=GDA:scaler2.CNT, type=DBR_TIME_STRING, count=1, ctx="diamrs0005l.diamond.ac.uk:6064""
        Source File: ../getCopy.cpp line 82
        Current Time: Tue Mar 28 2006 17:22:36.167980000
    ..................................................................

I get an error again however this time the 'Done' value gets written to the IOC exactly ONE MINUTE after I entered the caput command. This is long after the caput command has timed out so it appears the gateway is responsible for the delay?

Has anyone any idea what may be happening? Is there a 60 second timeout in CA or the gateway which may give a clue as to what I am seeing?

(For the record this test was done with a very lightly loaded test gateway serving only 20 or so PV's. Also using caput -w70 results in the same timeouts)

Pete Leicester

Senior Software Engineer

Diamond Light Source Ltd.

Rutherford Appleton Laboratory

Chilton

Didcot

OX11 0QX

Tel: 01235 778478

Replies:: Re: gateway enum writes Martin L. Smith; Re: gateway enum writes Tim Mooney

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ANJ, 02 Sep 2010

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System