104
•
Declarations of Conformity
Xtium2-CL MX4 User's Manual
Trigger Signal Total Delay
Opto-Coupler
t(oc)
Debouncer
t(d)
External Trigger
t(et)
Validated Trigger
t(vt) = t(et) + t(oc) + t(d)
Figure 30: External Trigger Input Validation & Delay
External Trigger Timing Specifications
t(et) time of external trigger in
s
t(oc) time opto-coupler takes to change state (time varies dependent on input voltage)
t(d)
user set debounce duration from 1 to 255
s
t(vt)
time of validated trigger in
s
Note:
Teledyne DALSA recommends using the fastest transition to minimize the time it takes
for the opto-coupler to change state.
If the duration of the external trigger is > t(oc) + t(d), then a valid acquisition trigger is detected.
It is possible to emulate an external trigger using the software trigger which is generated by a
function call from an application.
The following table provides the input switching points and propagation delay details.
Trigger Level
Switch Point
Propagation Delay
t(oc)
(
rising edge signal
↑
)
Propagation Delay
t(oc)
(
falling edge signal
↓
)
RS-422
1.6V
1.75
s
5.5
s
TTL
1.6V
1.75
s
5.5
s
12V
6V
2.6
s
2.6
s
24V
12V
1.9
s
3.1
s
