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

Subject: Troubleshooting the redirection-to-records feature of streamDevice
From: Kevin Peterson <kmpeters@anl.gov>
To: EPICS tech talk <Tech-talk@aps.anl.gov>
Date: Thu, 18 May 2017 12:00:42 -0500
I wrote stream support for an ADAM-4018 thermocouple reader.  The
support has the following "read" record:

record(bo, "$(P)$(R):read") {
  field(DTYP, "stream")
  field(DESC, "Read thermocouples")
  field(ZNAM, "Done")
  field(ONAM, "Read")
  field(OUT, "@ADAM_4018.proto queryAll($(A),$(P)$(R)) $(PORT)")
  field(SDIS, "$(P)$(R):mode")
  field(DISV, 1)
}

This is the definition of queryAll from the protocol file:

queryAll {
  out "#\$1";
  in
">%(\$2:ai0)f%(\$2:ai1)f%(\$2:ai2)f%(\$2:ai3)f%(\$2:ai4)f%(\$2:ai5)f%(\$2:ai6)f%(\$2:ai7)f";
}

And each of the ai records has this definition:

record(ai, "$(P)$(R):ai$(C)") {
  field(DESC, "Analog input $(C)")
  field(PREC, "3")
}

The read works (when the read record is processed, the eight ai records
get new values) in my development VME (MVME5100, VxWorks 6.9.4.1,
base-3.14.12.3, stream-2-6 from synApps_5_7).

When I move the support to another VME with the same
processor/VxWorks/EPICS configuration, the read doesn't work.  When the
read record is processed I see (via asyn traces) that the query command
gets sent to the thermocouple reader and a string of eight values is
returned, but none of the eight analog input records gets its VAL
updated, nor do they get processed.  I do not see any protocol error
messages.  I do see that the read record's VAL field has a value of
"Illegal_Value".

How can I troubleshoot this problem?  Does streamDevice provide any
debug capabilities that would allow me to confirm that the protocol
arguments in my queryAll function were expanded correctly?

Thanks,

Kevin

-- 
Kevin M. Peterson
(630) 252-8644
kmpeters@anl.gov

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