Experimental Physics and
Industrial Control System

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

Subject:	Parse a variable-length, multi-column waveform in stream device
From:	"Abdalla Ahmad" <[email protected]>
To:	"[email protected]" <[email protected]>
Date:	Wed, 8 Aug 2018 09:09:05 +0000

We are trying to implement an IOC for the Libera Spark BPM using stream device, one of the tricky commands for example is TBT_IQ <N> which returns a variable-length buffer of turn-by-turn data. An example:

TBT_IQ 3

22 -36 19 -38 16 -31 -3 -31

39 -212 29 -212 26 -163 -37 -150

39 -175 36 -176 27 -133 -21 -129

As you can see the output is an array of fixed columns (IQ parameters) and variable rows (waveforms length). In a single line you can easily parse and skip any value, but in this format we have two problems:

1. Is it possible to parse variable number of IN commands in the protocol file?

2. Variable "IN" commands mean variable waveform length, is this possible in EPICS?

Best Regards,

Abdalla Ahmad

Control Engineer

SESAME

Allan, Jordan.

Tel: (+962-5) 3511348 , ext. 265

Fax: (+962-5) 3511423

Mob: (+962-7)88183296

www.sesame.org.jo