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Experimental Physics and
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<== Date ==> <== Thread ==>

Subject: AO rec flaw
From: hill@luke.atdiv.lanl.gov (Jeff Hill)
To: tech-talk@aps.anl.gov
Date: Tue, 18 Jul 95 15:07:54 MDT
Hello all,

I just observed a passive analog output record that after rec init had
STAT=UDF_ALARM, SEVR=INVALID_ALARM, and UDF=0. My device support
successfully read the initial value out of the device (and 
indirectly set UDF to false). Once this record is processed for the 
first time then the UDF alarm condition goes away.

This appears to be a flaw in the AO record. The ascii rec def initializes
stat=UDF and sevr=INVALID. When the record inits if we get the value from the
device and the udf field becomes zero then we dont reset stat and sevr. 
Most likely we need to call alarm() from within AO rec support just after 
calling devRecInit()? Since recGblSetSevr() maximizes the alarm condition 
we would need to init stat/sevr to no alarm?

It is hard to believe that this has gone undetected for this long.

Has anyone else noticed a passive AO rec in alarm state UDF that 
successfully read its initial value from the IO but hasnt been processed 
for the first time?

Jeff


______________________________________________________________________
Jeffrey O. Hill			Internet	johill@lanl.gov
LANL MS H820			Voice		505 665 1831
Los Alamos, NM 87545 USA 	FAX		505 665 5107


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