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?
This is a ping command used to tell if the flowmeter is
communicating. The flowmeter will return an acknowledge sequence
of “OK” <CR> <LF> as a response.
Example 1) ? Returns “OK” <CR> <LF>
Error Codes
1 Unrecognizable command – The flowmeter uses the length
of the command and the first few letters (how many letters
depends on the command) to recognize a valid command.
2 Number out of range – The number entered as the operand
to a command was out of the specified range or
unrecognizable.
3 Invalid mode – One or more requested options to a
command were invalid.
4 Command not possible – The supplied operands describe a
command that is beyond the functional capability of the
flowmeter.
8 Internal error – An internal failure was detected.
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