Experimental Physics and
Industrial Control System

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

Subject:	data format conversion
From:	yincx--- via Tech-talk <tech-talk at aps.anl.gov>
To:	tech-talk <tech-talk at aps.anl.gov>
Date:	Fri, 21 Aug 2020 09:43:49 +0800

Hello everyone,

I am using the stream device to gat data from a device, and have a problem about format conbersion. I hope to get some advice and will appreciate for your help.

I want to send data, such as "09", in hexademical format to the device. the device will return a float data %f.

Statements in the db file:

recorrd(ai, "$(P)$(R)read")

{

field(DESC, "read pressure")

field(DTYP, "stream")

field(INP, "@pressure.proto SendCommand(09) $(PORT)")

field(SCAN, "1 second")

}

Statements in the protocol file is like this:

SendCommand{

out "\x\$1";

in "%f";

}

when I run the st.cmd, an error occurs:

Hex digit expected after \x: "\X""

if "09" is send directly, not as a variable "\$1":

SendCommand{

out "\x09";

in "%f";

}

everything goes well and I can get the returned %f correctly.

I wonder how can I send "09" as a variable? How to change a variable in the record to be hexadecimal?

Thank you very much for any advice, I will try it and give feedback.

Bset wishes

Chunxia Yin

Replies:: Re: data format conversion Florian Feldbauer via Tech-talk

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ANJ, 21 Aug 2020

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System