User`s manual

Operation and Features
BASLER A101
f 3-9
DRAFT
For better understanding of the use of trigger ready signal, consider an example. Assume that you
will set the exposure time to 20 µs for every exposure and that you want to begin exposing as early
as possible during transfer of the previous frame. In this case, the trigger ready signal will go high
20 µs before the earliest allowable end of exposure. This situation is illustrated in Figure 3-7.
Figure 3-7: Trigger Ready Signal
If you monitor the trigger ready signal, and toggle ExTrig when the trigger ready signal goes high,
the exposure will end at the earliest allowable point. Figure 3-8 illustrates how the ExTrig signal
should toggle if you want your 20 µs exposure time to overlap frame transfer as much as possible.
(Note that the trigger ready signal goes low when exposure starts.)
Figure 3-8: Using Trigger Ready to Time the ExTrig Signal
3.3.1 What Happens if you Toggle ExTrig while TrigRdy is Low
As explained above, the trigger ready signal is designed to ensure that exposure ends after the
previous frame transfer is complete. But what happens if you toggle ExTrig while the trigger ready
signal is low. In this case, the camera will remember that ExTrig has toggled and will delay the
start of exposure until the trigger ready signal goes high.
Frame 1 Transfer Frame 2 Transfer Frame 3 Transfer
20 µs
Trigger
Ready
Frame
Transfer
20 µs 20 µs
> 100 ns > 100 ns > 100 ns
Frame 1 Transfer Frame 2 Transfer Frame 3 Transfer
20 µs
Trigger
Ready
Frame
Transfer
20 µs
exposure
ExTrig
>100 ns
20 µs
>100 ns
20 µs
>100 ns
20 µs
exposure
20 µs
exposure