Experimental Physics and
Industrial Control System

I have a helium sensor that responds to a query with this reply:

  :80gv<VVVVVVVV><FFFFFFFF><CCCC><cr>

Where the non-constant parts of the response are ASCII hex characters
representing the following values:

  <VVVVVVVV> = (32 bit floating point) The current gas value
  <FFFFFFFF> = (32 bit unsigned integer) The sensor status
  <CCCC> = (16 bit unsigned integer) The message checksum

Is there a straightforward way to parse the floating point value using
StreamDevice format converters?

The raw double converter %R doesn't work, presumably because it is
interpreting the ASCII chars as bytes, rather than hex values.

The value can be read as an int with %08X, but it isn't obvious how to
then cast that value as a float.

Thanks,

Kevin

-- 
Kevin M. Peterson
(630) 252-8644
[email protected]

Replies:

Re: stream protocol question: ASCII hex to 32-bit float Florian Feldbauer

Re: stream protocol question: ASCII hex to 32-bit float Eric Norum

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