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

Subject: Stream Device parsing strings
From: Rod Nussbaumer <bomr@triumf.ca>
To: tech-talk@aps.anl.gov
Date: Wed, 11 Apr 2012 15:01:39 -0700
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.



Replies:
Re: Stream Device parsing strings Ralph Lange

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