SVS-Vistek SHR 10GigE, Manual

Page: 35 / 103

5.1.9 Trigger modes
To start capturing images, the camera has to receive a trigger signal. This trigger
signal can be a software trigger, it might be an electric signal on the hardware I/O
or it can be a timed trigger (sequence of images,
Precision Time Protocol ).
Software trigger
The camera exposure can be started via software. With some interface types like
GigE and USB3 it is impossible to have a 100% precise software trigger.
CoaXPress and Camera Link permit relatively precise triggering of the camera. If
you need to have a precise trigger, usage of
"External hardware trigger" on
page 61 is recommended.
External hardware trigger
External trigger with programmable exposure time. In this mode the camera is
waiting for an external trigger pulse that starts integration, whereas exposure time
is programmable via the serial interface and calculated by the internal micro-
controller of the camera. Default input is Input1 for trigger.
At the rising edge of the trigger the camera will initiate the exposure.
The software provided by SVS-Vistek allows the user to set exposure time e.g.
from 60 μs to 60 sec (camera type dependent).
Exposure time of the next image can overlap with the frame readout of the current
image (trigger pulse occurs when FVAL is high). When this happens, the start of
exposure time is synchronized to the negative edge of the LVAL signal (see fig-
ure)
When the rising edge of trigger signal occurs after frame readout has ended
(FVAL is low), the start of exposure time is not synchronized to LVAL and expos-
ure time starts after a short and persistant delay.
5 Feature description 35