Specifications

NOTES 1. When TRIGger:SOURce is not TIMer, ARM:SOURce must be set to IMMediate
(the *RST condition). If not, the INIT command will generate an error
-221,"Settings conflict."
2. When TRIGger:SOURce is TIMer, the trigger timer interval (TRIG:TIM
<interval>) must allow enough time to scan all channels, execute all algorithms
and update all outputs or a +3012, “Trigger Too Fast” error will be generated
during the algorithm cycle. See the TRIG:TIM command on page 309 for details.
To set the trigger source to the internal Trigger Timer (the default):
TRIG:SOUR TIMER now select ARM:SOUR
To set the trigger source to the External Trigger input connection:
TRIG:SOUR EXT an external trigger signal
To set the trigger source to a VXIbus TTLTRG line:
TRIG:SOUR TTLTRG1 the TTLTRG1 trigger line
Selecting Trigger Timer
Arm Source
Figure 3-7 shows that when the TRIG:SOUR is TIMer, the other trigger sources
become Arm sources that control when the timer will start. The command to select
the arm source is ARM:SOURce <source>.
·
The <source> parameter choices are explained in the following table
Parameter Value
Source of Arm (after INITiate:¼ command)
BUS ARM[:IMMediate]
EXTernal “TRG” signal input on terminal module
HOLD ARM[:IMMediate]
IMMediate The arm signal is always true (scan starts when an
INITiate:¼ command is received).
SCP SCP Trigger Bus (future SCP Breadboard)
TTLTrg<n> The VXIbus TTLTRG lines (n=0 through 7)
NOTE When TRIGger:SOURce is not TIMer, ARM:SOURce must be set to IMMediate
(the *RST condition). If not, the INIT command will generate an error
-221,"Settings conflict."
To set the external trigger signal as the arm source:
ARM:SOUR EXT trigger input on connector
module
Programming the VT1419A Multifunction
Plus
Setting up the Trigger System
78 Chapter 3
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