IEEE 488.2 Command Reference 17
N1911A/1912A P-Series Power Meters Programming Guide 761
SDC
The SDC (Selected Device Clear) command causes instruments using GPIB
in the listen state, to assume a cleared condition. The definition of a
selected device clear is unique for each instrument. For the power meter:
• All pending operations are halted, that is, *OPC? and *WAI.
• The parser (the software that interprets the programming codes) is
reset and now expects to receive the first character of a programming
code.
• The output buffer is cleared.
SPD
The SPD (Serial Poll Disable) command terminates the serial poll mode for
the power meter and returns it to its normal talker state where device
dependent data is returned rather than the status byte.
SPE
The SPE (Serial Poll Enable) command establishes the serial poll mode for
the power meter. When the power meter is addressed to talk, a single
eight bit status byte is returned.
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