Trig Mode: The Trig Mode field is used to select the trigger protocol.
Bit 5
Bit 4
Trigger Output:
0
0
Synchronous
0
1
Semi-synchronous
1
0
Asynchronous
1
1
Output
Trig/Arm Source: The Trig/Arm Source field is used to select the trigger
or Arm source. When Bit 9 (Select Trigger Timer) is set to 0, the sources in
the following table are the trigger sources. When Bit 9 is set to 1 (timer is
trigger source), the following become ARM sources for the Trigger Timer.
Bit 3
Bit 2
Bit 1
Bit 0
Trigger/Arm
Source:
0
0
0
0
TTLTRG0
0
0
0
1
TTLTRG1
0
0
1
0
TTLTRG2
0
0
1
1
TTLTRG3
0
1
0
0
TTLTRG4
0
1
0
1
TTLTRG5
0
1
1
0
TTLTRG6
0
1
1
1
TTLTRG7
1
0
0
0
Software
1
0
0
1
External
1
0
1
0
SCP
1
0
1
1
Trigger
Immediate
1
1
X
X
none selected
Using the Trigger
Mode Register
To support the various trigger modes, the correct values must be set in each
of the fields of the Trigger Mode Register. Below are example settings for
the trigger modes supported.
Sync: To support the VXI trigger mode sync, the Trigger Mode field is set
to “ Sync” , and the Trigger Source field set to one of the TTLTRG* lines.
It does not matter what the Trig Out field is set to. See the VXI document
for more information on this trigger protocol.
Semi-Sync: To support the VXI trigger mode Semi-sync, the Trigger Mode
field is set to “ Semi-sync” , the Trigger Source field set to one of the
TTLTRG* lines, and the Trig Out field set to the same TTLTRG* line,
which was set in the Trigger Source field. See the VXI document for more
information on this trigger protocol.
Async: To support the VXI trigger mode Async, the Trigger Mode field is set
to “ Async” , the Trigger Source is set to the lower line of a TTLTRG* line pair,
and the Trig Out field is set to the higher line of the TTLTRG* line pair. See
the VXI document for more information on this trigger protocol.
Appendix D
Register-Based Programming 355
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