32 U2781A User’s Guide
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 {0|1|2|3|4|5|6|7}
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
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