VT1422A Command Reference 319Chapter 7
OUTPut

OUTPut:TTLTrg:SOURce

OUTPut:TTLTrg:SOURce <trig_source> selects the internal source of the trigger
event that will operate the VXIbus TTLTRG lines.
Parameters
Comments •The following table explains the possible choices.
•FTRigger (First TRigger) is used to generate a single TTLTRG output when
repeated triggers are being used to make multiple executions of the enabled
algorithms. The TTLTRG line will go low (asserted) at the first trigger event
and stay low through subsequent triggers until the trigger count (as set by
TRIG:COUNT) is exhausted. At this point the TTLTRG line will return to its
high state (de-asserted). This feature can be used to signal when the VT1422A
has started running its control algorithms.
•Related Commands: OUTP:TTLT<n>[:STATE], OUTP:TTLT:SOUR?,
TRIG:SOUR, TRIG:COUNT
•*RST Condition: OUTP:TTLT:SOUR TRIG
•Send with VXIplug&play Function: hpe1422_cmd(...)
Usage OUTP:TTLT:SOUR TRIG toggle TTLTRG line every time module is
triggered (use to trigger other VT1422As)

OUTPut:TTLTrg:SOURce?

OUTPut:TTLTrg:SOURce? returns the current setting for the TTLTRG line source.

Comments •Returned Value: Discrete, one of; TRIG, FTR, or SCP. The data type is string.

•Related Commands: OUTP:TTLT:SOUR
•Send with VXIplug&play Function: hpe1422_cmdString_Q(...)
Usage OUTP:TTLT:SOUR? enter statement will return on of FTR,
SCP or TRIG
Parameter
Name Parameter
Type Range of
Values Default
Units
trig_source discrete (string) ALGorithm | TRIGger | FTRigger | SCPlugon none
ALGorithm Generated by the Algorithm Language function "interrupt()."
FTRigger Generated on the First Trigger of a multiple "counted scan"
(set by TRIG:COUNT <trig_count>).
SCPlugon Generated by a Signa l Conditioning Plug-on (SCP).
Do not use this when Sample-and-Hold SCPs are installed.
TRIGger Generated every time a scan is triggered (see TRIG:SOUR
<trig_source>).