BNC 1105 Universal Counter - Manual (Page 136)

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Return
Numeric data transferred as ASCII bytes in format, which is 21.
The response is one greater than the maximum which can be sent as a
parameter to the *SAV and *RCL commands.
:READ[[:SCALar]:]?
The command is usually used with a :CONFigure command to make
measurements like Command :MEASure?. User can specify individual setting for
their measurements by adding setting specification commands between them.
This command is the generic form of the Command :READ?. Skipping the
and the will instruct the counter to use the function
specified by the last command :CONFigure, :MEASure, :READ, or :FETCh. When
[:SCALar]: is specified, the counter returns the specified result if it is
consistent with the current measurement function or it can be derived from the
current measurement function. Refer to Commands :FETCh? in this section for
the derivability of functions.
Return
Result will be formatted according to :FORMat[:DATA] ASCii|REAL setting.
If using ASCii format, numeric data is transferred as ASCII bytes in
format with 1 to 5 significant digits depending on the resolution.
Notes
Sending this command while a measurement is in progress will terminate
the current measurement, idle the measurement cycle before initiating the
desired measurement and waits for the measurement to complete. It holds
off further commands from being executed until the current measurement
completes. However, you can use Device Clear or power-on to cancel this
hold-off effect.
When an automatically armed Totalize measurement is in progress, sending
a :READ? Command will cause error -221 and Not a Number 9.91E37 will be
returned. Use :INItiate to begin the measurement and :ABORt to end
it; :FETCh? should be used to retrieve the terminated measurement result.
The Command :SENSe
[:SENSe]DATA? [“[:]SENSe[1]”]