Agilent Technologies U2781A manual Trigger Out, External Trigger In Star Trigger

3 Features and Functions

Trigger Out

Trigger Out selects one of the trigger bus bit [0...7] for external trigger. The USB device in Figure 3- 3 controls the multiplexer switching for the trigger out selection.

The SCPI command below is used to set one of the trigger bus [0…7] as external trigger source:

TRIGger:OUT {01234567}

Trigger Out	Function
Bit-0	Time base
Bit-1	Reserved
Bit-2	Reserved
Bit-3	A/D trigger
Bit-4	Reserved
Bit-5	Reserved
Bit-6	Reserved
Bit-7	D/A trigger

External Trigger In (Star Trigger)

The star trigger bus offers a very high performance or precise synchronization between modules.The star trigger bus is a dedicated trigger line between the External Trigger Input and USB slots. This trigger signal is sent from external to each slot through a 1- to- 6 CLK buffer. The slot- to- slot skews are minimized to ensure that trigger signal reaches all six slots simultaneously. Refer Figure 3- 4 for the star trigger bus architecture.

To set star trigger as the module trigger source, the SCPI command below is sent to the modules:

OUTP:TRIG:SOUR STRG

32 U2781A User’s Guide