OUTPut:TTLTrg:SOURce
OUTPut:TTLTrg:SOURce <
trig_source
>
selects the internal source of the trigger
event that will operate the VXIbus TTLTRG lines.
HP E1313 Note
Most B-Size mainframes do not support VXIbus TTLTRG lines.
Parameters
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
<
trig_source
>
discrete (string)
TRIGger | FTRigger | SCPlugon | LIMit
none
Comments
•
The following table explains the possible choices.
Parameter Value
Source of Trigger
FTRigger
Generated on the First TRigger of a multiple “counted
scan” (set by TRIGger:COUNt <
trig_count
>).
LIMit
Generated when a channel’s limit test is exceeded.
SCPlugon
Generated by a Signal Conditioning Plug-on (SCP).
TRIGger
Generated every time a scan is triggered (see
TRIGger:SOURce <
trig_source
>).
•
FTRigger
(First TRigger) is used to generate a single TTLTRG output when
repeated triggers are being used to make multiple passes through a scan list. 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
TRIGger:COUNt
) is
exhausted. At this point the TTLTRG line will return to its high state
(de-asserted). This feature can be used to have one HP E1413 trigger (set to
OUTPut:TTLTrg:SOURce FTRigger
and
OUTPut:TTLTrg<
n
>:STATe ON
) a
second HP E1413 (set to
TRIGger:SOURce TTLTrg<
n
>
). The second module
will be triggered in the ratio
1
TRIGger:
COUNt
module#1
For an example of this arrangement, see “ Timer Based Scans at Different Rates”
on page 118.
•
Related Commands:
OUTPut:TTLTrg<
n
>[:STATe]
,
OUTPut:TTLTrg:SOURce?
,
TRIGger:SOURce
,
TRIGger:COUNt
•
*RST Condition:
OUTPut:TTLTrg:SOURce TRIGger
Usage
OUTP:TTLT:SOUR LIM
Toggle TTLTRGn line when limit test
exceeded.
OUTPut
Chapter 5
HP E1313/E1413 Command Reference 217
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