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

Subject: Re: Stream Device parsing strings
From: Rod Nussbaumer <bomr@triumf.ca>
To: Ralph Lange <Ralph.Lange@gmx.de>
Cc: tech-talk@aps.anl.gov
Date: Thu, 12 Apr 2012 09:24:43 -0700
Thanks Ralph.

I forgot to mention that I initially tried to read into a waveform record as an array of strings, but when that failed, I moved on to an alternative possibility. I will try Dirk's suggestion, and if that works, I'm happy.

   ---   rod.



Ralph Lange wrote:
Rod,

the "Separator" variable sets the separating character when reading
*array* data into waveform records. (So that it works with any number of
elements.)
In your case of non-array data, just use semicolon characters at the
appropriate positions inside the format string.

Good luck,
~Ralph


On Thu Apr 12 2012 00:01:39 GMT+0200 (CEST), Rod Nussbaumer
<bomr@triumf.ca>  wrote:
Hi all.

I am trying to get streamDevice to break an input string that has
fields delimited with semi-colons into discrete strings. The input
string as read by asyn + GPIB looks something like

BIN;RI;MSB;4;32;500;Y;100.00000000000E-12;20.90000000000E-9;"s";0.05000000000;5.00000000000E-9;21.00000000000E-9;0.00500000000;232.83064365387E-12;0.0000;"V";"C2,
50.00mV/div, 5.000ns/div,500 points, Sample mode";"C2"

My stream device protocol looks like:


WFMPRE {
     ReplyTimeout = 200;
     ReadTimeout = 50;
     InTerminator = LF;
     Separator = ";";
     out "VERBOSE ON";
     out "WFMO?";
     in
"%(\$1PARAM01.VAL)s%(\$1PARAM02.VAL)s%(\$1PARAM03.VAL)s%(\$1PARAM04.VAL)s%(\$1PARAM05.VAL)s%(\$1PARAM06.VAL)s%(\$1PARAM07.VAL)s";
     out "VERBOSE OFF";
}

where the records referred to by $1PARAMxx.VAL are stringout records
with SoftChannel DTYP. Each successive conversion ends at either the
39th converted character, or the first whitespace. It seems to be
completely ignoring the specified separator. Is this correct behavior?
If so, any suggestions for accomplishing what I want (ability to
access the string fields as records or as string elements of a
waveform record. I intend to add more field conversions to complete
the string parsing, if/when I get this much working.

The data in question comes from a Tektronix scope, and contains the
data need to convert a generically scaled waveform array into an array
scaled to engineering units.

Thanks.

Rod Nussbaumer
ISAC Controls, TRIUMF
Vancouver, Canada.





References:
Stream Device parsing strings Rod Nussbaumer
Re: Stream Device parsing strings Ralph Lange

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