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xx = AZ Read analog zero intercept (returns –100 to 100)
xx = BT Read begin-trigger value (returns xxnnn.nn).
xx = ET Read end-trigger value (returns xxnnn.nn).
xx = G Read gas calibration (returns 0 to 6).
xx = P Read the current pressure setting (returns 0 to 200)
xx = SR Read rate (returns 0 to 1000).
xx = U Read flow units (returns S or V).
Returns current values in ASCII format. Leading zeroes are not
returned.
After the command is processed, an acknowledge sequence of “OK”
<CR> <LF> is sent followed by the data and by the termination
sequence <CR> <LF>. If the command generated an error instead of
“OK” <CR> <LF> being sent, an error code of “ERRn” <CR> <LF> will
be sent. See the end of this section for a list of possible error codes.
Example 1) RU Read flow units. Returns “OK” <CR> <LF> “S”
<CR> <LF>
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