Generator Control

The commands used for control of the CMU's RF and AF signal generators are analogous to the measurement control commands explained in section Event Reporting . The generators are in one of the following two generator states:

OFF	generator switched off, resources released
RUN	generator running

The RUN state corresponds to the status indication ON in the RF generator softkey (see section Measurement Menu Analyzer/Generator).

The relation between generator commands and generator states is shown in the following diagram:

Generator states and control commands

Generator control commands are recognized by the second-level keyword RFGenerator or AFGenerator. The generator control commands behave as follows:

`INITiate: RFGenerator INITiate: AFGenerator...`		Starts the generator, reserves all necessary hardware resources and changes to the generator state RUN. As illustrated in the figure above, `INITiate` can be called in any generator state. If the generator is already running (RUN), `INITiate` has no effect. If the generator can not be started due to a resource conflict it remains in the OFF state, and the measurement status returned by the `FETCh:<meas_obj>:STATus?` is ERR. At the same time the SCPI error -213, Init ignored, is generated.

Possible resources conflicts		The RF connector is already allocated by another generator. The other generator must be switched off first.

Sequential execution		`INITiate` is implemented as a sequential command. The `*OPC` command (see Common Commands) can be applied together with the `INITiate` command.

`ABORt: RFGenerator ABORt: AFGenerator...`		Switches the generator off, releases the hardware resources for other generators, and changes to the generator state RUN. As illustrated in the figure above, `ABORt` can be called in any generator state. If the generator is switched off (OFF), `ABORt` has no effect.

Sequential execution		`ABORt` is implemented as a sequential command. The command is not terminated before the generator is completely switched off.

Note:
In some function groups (e.g. in function group Audio), several RF or AF generators can be used. Generators relying upon the same system resources cannot be switched on simultaneously. The R&S® CMU provides a mechanism to decide whether conflicting generators are persistent or releasable; see section Task Priority Management.