LeCroy PXA125, User Manual

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User Manual PXA125
Programming Reference 4-69
TRIGger:SLOPe{POSitive|NEGative}
Purpose
This command will set the edge sensitivity for the trigger input.
•
<POSitive> will set the positive edge
•
<NEGative> will set the negative edge
Parameter type
Discrete
TRIGger:SLOPe?
Response and default
The PXA125 will return POS, or NEG depending on the present trigger setting. Default value is POS.
TRIGger:SOURce:ADVance{EXTernal|INTernal|TTLTrig<N>|STAR}
Purpose
This command will set the advance source for the trigger mode. The backplane on the PXI chassis has some
signals on the P2 connector that allow inter-instrument communication and synchronization. Among these
lines, there are some trigger lines, STAR trigger, and local bus lines. There are 8 trigger lines that can serve
as source or target. Normally, these lines are designated as tri-state lines. The TRIG:SOUR:TTLT<N>
command converts one of these lines to input. <N> can range from 0 through 7. Note that only one input can
be selected as an advance source.
•
<EXTernal> will select the external input
•
<INTernal > will select the internal trigger generator
•
<N> can be selected from 0 through 7
•
<STAR> will select the STAR trigger module. Select this option only if you have a STAR module in your
system
Parameter type
Discrete
TRIGger:SOURce:ADVance?
Response and default
The PXA125 will return EXT, INT, TTLT<N>, or STAR depending on the present trigger advance source
setting. Default value is EXT.
TRIGger:STAR{OFF|ON|0|1}
Purpose
In addition to bused PXI triggers, the PXI bus has included an independent trigger (PXI_STAR) for each slot
that is oriented in a star configuration from the star trigger slot. The star trigger slot is adjacent to the system
slot and uses the 13 left local bus signals as the star triggers. The PXI_STAR specifications are only partially
implemented in the PXA125 where only 8 star lines are being addressed, all of them in parallel thus, if you
plug the card in slot 2 and turn TRIG:STAR ON, the front-panel SYNC signal will be routed to 8 STAR lines
simultaneously. The PXA125 controls star lines in slots 3 through 10.
•
ON or 1 will make STAR lines in slots 3 through 10 active