98 Keysight M8070A Programming Guide5 SCPI Command ReferenceSubsystemsThe SCPI commands are divided into subsystems, which reflect the variousfunctionality of the instrument. The following figure shows where theport-related subsystems are located.Table 20 SubsystemsSubsystem DescriptionSTATus The STATus subsystem reports the current system condition,when an event changes and sets transition filter states toreport when a passing event occurs.TRIGger The TRIGger subsystem selects the following trigger modes:• INTernal selects the 100 MHz reference clock of the AXIechassis.• REFerence selects a 10 MHz/100 MHz external referenceclock.• DIRect selects the clock in the M8041A and can be setmanually from 8.1 GHz to 16.2 GHz as the systemfrequency.• CMULtiplier selects a multiplied or divided clock tospecify the system frequency.SOURce The SOURce subsystem controls output signals (forexample, for setting frequency and levels).OUTPut The OUTPut subsystem controls the output ports of thepattern generator.INPut The INPut subsystem controls the input ports of the errordetector.CLOCk The CLOCk subsystem is used to detect clock source or toset the clock frequency applied to input or output channel.FETCh The FETCh subsystem is used to query the error detector’sresults.MMEMory The MMEMory subsystem is used to store and recallpredefined or custom created settings and patterns.
