Motorola R-2550 Programming Reference Manual page 35

Optional Response Parameters
The M? and equivalent ? queries allow the controller to optionally specify which response parameters should be
returned. Each of these queries takes a single <Decimal Numeric Program Data> parameter, which is optional.
When this parameter is not specified, the queries return the exact syntax as specified by the corresponding
measurement command. When the parameter is specified, it defines a single, specific response parameter to be
returned. The range of the parameter varies according to the possible number of response parameters that may be
returned upon initiation by the measurement command.
Examples
The command/query sequence
returns
MMP x.xx; MMN x-xx
The
returns
The command/query sequence
returns
The command/query sequence
returns
Motorola Communications Analyzer
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Programming Reference