Experimental Physics and
Industrial Control System

Dirk Zimoch <[email protected]> · Mon, 05 Feb 2007 14:32:46 +0100

Hi Phillip,
sorry for the late reply but I was on vacation.
As you already found out yourself, the "skip bytes between value and checksum"
feature has been added only in the latest patch (20060717). Thus either apply
StreamDevice-2-1-patch20060717 or use the CVS snapshot as you did.
All users of StreamDevice should have a look at
http://epics.web.psi.ch/software/streamdevice/ from time to time be informed
about new features, bugs (solved and unsolved) and patches.
The online documentation is always from the latest (CVS) version and some
documented features may not be available until the latest patches have been applied.
Yours
Dirk
Phillip A. Sorensen wrote:

From: Phillip Sorensen [mailto:[email protected]]
I am trying to get a device working with StreamDevice 2-1.  My device
returns a message in the form of "OK:value,checksum".  The checksum is
only for the value part of the message.  I am able to skip the "OK:" by
using the width field, but trying to use the precision field to skip the
"," between the value and checksum gives an error about not being able
to use the precision field.
Is there a way to tell the parser to skip the ","?

According to the docs, this should be achievable as you suggest, using:
in "OK:%f,%3.1<xor>"
or whatever value and checksum conversion type you need.
I've looked at the code and can't see why a precision wouldn't work.
What is the error message, exactly?

The line in the protocal file is "OK:%f,%3.1<sum8>".  And the error is
"Use of precision field only allowed in output formats". From what I can
tell the error comes from the StreamProtocol.cc file in StreamDevice-2.1.
I have moved to snapshot-20061002, and things are working.

--
Dr. Dirk Zimoch
Swiss Light Source
Computing and Controls
Paul Scherrer Institut
phone +41 56 310 5182
fax   +41 56 310 4413

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System