RE: drvAscii codes

["Porter, Rodney R." <rporter@anl.gov>]

Ian, 
The documentation says that what you have should work.  I practice, I
have used \x03 and \x02 instead of \003 and \002 for a similar device
and it has worked.  Let me know if this fixes your problem.  

Rodney Porter
Sr. Scientific Programmer
Data Aquisition & Detector Systems
Intense Pulsed Neutron Source
Argonne National Laboratory 
9700 So. Cass Ave 
Argonne, IL  60439 USA 
Ph. (630) 252-7151
E-mail: rporter@anl.gov 
IPNS website: www.pns.anl.gov

-----Original Message-----
From: Ian A Smith [mailto:ias@roe.ac.uk] 
Sent: Friday, March 03, 2006 4:10 AM
To: tech-talk@aps.anl.gov
Subject: drvAscii codes

I'm trying to get epics to talk to an (awkward) piece of equipment.  It
requires: "[stx]command[etx][cr][lf]", where of course, [stx] and [etx]
are ascii 2 and 3.

I've succeeded in puting the [etx] on the end of lines but I get the
literal string "\002" instead of [stx] at the start, so I'm looking for
help!

The record which successfully puts [etx] in line termination is:

record(stringout,"scu2CCS:shutter:coms:txCmd") {
     field(DESC,"string output record")
     field(SCAN,"Passive")
     field(PINI,"YES")
     field(PHAS,"0")
     field(EVNT,"0")
     field(DTYP,"Ascii SIO")
     field(DISV,"1")
     field(SDIS,"0.000000000000000e+00")
     field(DISS,"NO_ALARM")
     field(PRIO,"LOW")
     field(FLNK,"0.000000000000000e+00")
     field(VAL,"\003\r\n")
     field(DOL,"\003\r\n")
     field(OMSL,"closed_loop")
     field(OUT,"@/pty/shutterM <writeCmt %s>")
     field(SIOL,"0.000000000000000e+00")
     field(SIML,"0.000000000000000e+00")
     field(SIMS,"NO_ALARM")
     field(IVOA,"Continue normally")
     field(IVOV,"")
}

and the record which fails to put [stx] in the command line is:

record(stringin,"scu2CCS:shutter:test") {
     field(DESC,"string input record")
     field(SCAN,"10 second")
     field(PINI,"NO")
     field(PHAS,"0")
     field(EVNT,"0")
     field(DTYP,"Ascii SIO")
     field(DISV,"1")
     field(SDIS,"0.000000000000000e+00")
     field(DISS,"NO_ALARM")
     field(PRIO,"LOW")
     field(FLNK,"0.000000000000000e+00")
     field(VAL,"string")
     field(INP,"@/pty/shutterM <\002SUI><%s>")
     field(SIOL,"0.000000000000000e+00")
     field(SIML,"0.000000000000000e+00")
     field(SIMS,"NO_ALARM")
}

TIA
-- 
Ian A Smith               Telephone: +44 (0) 131 668 8255
Royal Observatory         Fax:       +44 (0) 131 668 8314
Blackford Hill            Web:       http://www.roe.ac.uk/
Edinburgh
EH9 3HJ
UK