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These flowmeters use ASCII characters as the input command set.
Each command sent to the flowmeter must be terminated by a
carriage return (CR = 0x0d). Line feeds (LF = 0x0a ) are ignored.
Some commands allow you to choose either ASCII or binary format
for the returned data. Binary data transfers allow for faster operation.
Some operating parameters can be stored in nonvolatile memory to
serve as the new power-on defaults (example: sample rate, gas
calibration, etc). After selecting the new operating parameter value,
initiate the SAVE command to permanently store this new value. If
the SAVE command is not initiated, the change to the operating
parameter will be lost when the flowmeter is turned off. The factory
default operating parameters can always be reset by initiating the
DEFAULT command.
The meter send an acknowledge sequence to confirm that the
command was received. For ASCII commands, the acknowledge
sequence is “OK” <CR> <LF>. For binary commands, a single byte,
0x00 is returned.
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