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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: gateway enum writes |
| From: | Kate Feng <[email protected]> |
| To: | Mark Rivers <[email protected]> |
| Cc: | "Kenneth Evans, Jr." <[email protected]>, [email protected] |
| Date: | Thu, 30 Mar 2006 11:02:01 -0500 |
Mark Rivers wrote:As what I stated, the problem does not happen to all the LinuxFor what it's worth, the problem with the scaler record's CNT field behaving strangely with medm is seen with medm running on Linux, platforms. It always happened only on my RedHat7.3 Linux notebook. We have never seen this problem on the other Linux platforms. Probably not. My tests were based on the same IOCbut not on Windows. I don't know if the difference is dues to differences in CA or XWindows on these platforms. accessed via various versions of Linux PCs running MEDM Version 3.0.3. Kate But I don't think this behaviour is necessarily related to the caPutCallback problem with the gateway. I think the medm behavior here may be caused by a caPut to the CNT field rapidly causing a change in the CNT field that medm somehow loses track of? Mark ________________________________ From: Kate Feng [mailto:[email protected]] Sent: Thu 3/30/2006 9:12 AM To: Kenneth Evans, Jr. Cc: [email protected] Subject: Re: gateway enum writes Just a comment about the Joerger scaler/MEDM problem, which I do not think is related to gateway. Kenneth Evans, Jr. wrote: On looking at the original message I can guess that you are using a Joerger scaler. The Joerger scaler does not play well with channel access. It does not work well with MEDM, either on Solaris or Linux. I investigated this some time ago, to the extent I was convinced it was not MEDM. The beam line people that were using it at that time did not have enough expertise to determine the real cause of the problem. The same problem has appeared at various sites since. My recollection is that the workaround for the Joerger scaler is to push the buttons alternately to get it to be done. You can also have two screens and use the buttons on both of them. You'll have to experiment. I observed the above Joerger scaler/MEDM problem on my RedHat7.3 Linux PC, but not on the RedHat9.0 Linux PC, and other Debian Linux PCs in the beamlines. In all cases, the IOCs are run under EPICS3.14.x/RTEMS. Regards, Kate |