Agilent Technologies 33220A User Manual page 209

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Chapter 4 Remote Interface Reference
Frequency-Shift Keying (FSK) Commands
FSK Commands
Use the APPLy command or the equivalent FUNC, FREQ, VOLT, and
VOLT:OFFS commands to configure the carrier waveform.
FSKey:SOURce {INTernal|EXTernal}
FSKey:SOURce?
Select an internal or external FSK source. The default is INT.
The :SOUR? query returns "INT" or "EXT".
• When the Internal source is selected, the rate at which the output
frequency "shifts" between the carrier frequency and hop frequency
is determined by the FSK rate specified (FSK:INT:RATE command).
• When the External source is selected, the output frequency is
determined by the signal level on the rear-panel Trig In connector.
When a logic low level is present, the carrier frequency is output.
When a logic high level is present, the hop frequency is output.
• The maximum external FSK rate is 1 MHz.
• Note that the connector used for externally-controlled FSK waveforms
(Trig In) is not the same connector that is used for externally-
modulated AM, FM, PM, and PWM waveforms (Modulation In).
When used for FSK, the Trig In connector does not have adjustable
edge polarity and is not affected by the TRIG:SLOP command.
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