XL80 laser system
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Appendix B
Remote triggering
The remote trigger facility allows data to be captured by the calibration
software, upon receipt of a trigger signal generated remotely, for example,
from a machine under test�
The trigger signal is input via the auxiliary I/O port on the rear panel of the
XL laser� The XL laser supports two types of trigger signal – ‘slow trigger’
and ‘fast trigger’� These are accessed by two different pins on the auxiliary
I/O connector�
Fast trigger
The fast trigger mode provides a high-speed hardware trigger facility with a
short delay (< 1 µs) between the leading edge of the trigger input pulse and
the instant that the laser reading is recorded�
The fast trigger signal must be a clean, debounced TTL, CMOS or SSR signal
applied to the fast trigger pin on the auxiliary I/O connector, as shown in
Figure 1 opposite�
Fast trigger specifications
Active edge
Falling
Minimum pulse width
1 µs
Maximum trigger rate
50 kHz
Trigger delay
±1 µs
Maximum input voltage
±12 Vw
Open
Closed
Pulse width
> 1 µs
Active edge: Position sampled here within ±1 µs
Trigger repetition period > 20 µs
Fast trigger input Pin 14
Trigger input protected
to ± 12 V DC
TTL
TTL
10 K
+3.3 V
0 V
TTL
Pin 17
Figure 1
Electrical interface for fast triggering�
