IEEE 488.2 Command Reference 17
N1911A/1912A P-Series Power Meters Programming Guide 757
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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