7-12
Triggering
Model 6487 Reference Manual
External triggering
Input and output triggers are received and sent via the rear panel TRIGGER LINK connec-
tor. The trigger link has six lines. At the factory line #2 is selected for output triggers and
line #1 is selected for input triggers. These input/output assignments can be changed as
previously explained in this section. The connector pinout is shown in
Figure 7-4
Trigger link connection operation
Input trigger requirements
An input trigger is used to satisfy event detection for a trigger model layer that is using the
TLINK control source. The input requires a falling-edge, TTL-compatible pulse with the
specifications shown in
Figure 7-5
Trigger link input pulse specifications
8
7 6
5
4
3
2 1
Rear Panel Pinout
Pin Number
Description
1
2
3
4
5
6
7
8
Trigger Link 1
Trigger Link 2
Trigger Link 3
Trigger Link 4
Trigger Link 5
Trigger Link 6
Ground
Ground
Trigger Link
Triggers on
Leading Edge
TTL High
(2V-5V)
TTL Low
(<0.8V)
2
μ
s
Minimum
