10-18
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2600AS-901-01 Rev. B / September 2008
Section 10: Triggering
Series 2600A System SourceMeter® Instruments Reference Manual
Assigning input trigger events
Each event blender has four stimulus inputs. A different trigger event ID can be assigned to each
stimulus input. The following example assigns the source complete event IDs of SMUA and SMU
B to stimulus inputs 1 and 2 of event blender 1:
trigger.blender[1].stimulus[1] = smua.SOURCE_COMPLETE_EVENT_ID
trigger.blender[1].stimulus[2] = smub.SOURCE_COMPLETE_EVENT_ID
Action overruns
Action overruns are generated by event blenders depending on the mode, as shown in
Table 10-4
Action overruns
LAN triggering overview
Triggers can be sent and received over the LAN interface. The Series 2600A supports LAN
extensions for Instrumentation (LXI) and has eight LAN triggers that generate and respond to LXI
trigger packets.
Understanding hardware value and pseudo line state
LAN triggering is very similar to hardware synchronization except LXI trigger packets are used
instead of hardware signals. The
hardware value
is a bit in the LXI trigger packet that simulates
the state of a hardware trigger line. The Series 2600A stores the hardware value of the last LXI
trigger packet sent or received as the
pseudo line state
.
The
stateless event flag
is a bit in the LXI trigger packet that indicates if the hardware value
should be ignored. If set, the Series 2600A ignores the hardware value of the packet and
generates a trigger event. The Series 2600A always sets the stateless flag for outgoing LXI trigger
packets. If the stateless event flag is not set, then the hardware value indicates the state of the
signal. Changes in the hardware value of consecutive LXI trigger packets are interpreted as edge
transitions. Edge transitions generate trigger events. If the hardware value does not change
between successive LXI trigger packets, the Series 2600A assumes an edge transition was
missed and generates a trigger event.
illustrates edge detection in LAN triggering.
NOTE Instruments that are compliant to LXI versions prior to 1.2 always
process the hardware value. Instruments compliant to LXI version 1.2
and later are required to ignore the hardware value when the
stateless event flag is set.
Mode
Action overrun
And
Generates an overrun when a second
event on any of its inputs is detected
before generating an output event.
Or
Generates an overrun when two events
are detected simultaneously.
