STC-A33A
User Guide
21
Rev 1.0
C. Edge Preset Trigger Mode
In this
“Edge Preset Trigger Mode” with positive polarity, the camera exposure starts at the rising edge of the trigger signal. In
this mode, the exposure duration time is based on the preset exposure time (shutter speed) by the camera setting
communication or the DIP Switch on the rear panel.
1. Edge Preset Trigger Mode (V-Reset)
Note 1: The camera does NOT switch to the normal mode when the long exposure mode is selected. This timing chart shows
when the long exposure mode is selected.
Note 2: The internal VD signal is reset immediately after the exposure is finished; the video output signal is sent out according
to that reset VD timing.
Note 3: The exposure time is controlled by the camera setting communication (Refer to the command 20H and 21H) or the
DIP Switch on the rear panel as “shutter speed”.
Note 4: External VD signal inputs continuously during the external sync mode. External VD signal is disregarded during the
trigger mode.
Note 5: The WEN signal does not output when the exposure by the trigger signal does not exist.
Normal mode
Exposure time
Max. 1H
Trigger mode
Normal mode
Automatically switch to the normal
mode if the pulse width of the
trigger signal is more than
500 mseconds
Note. 1
Function mode
Internal VD
CCD exposure
Trigger signal
(Rising edge)
Video out
Note. 2
Note. 3
WEN signal out
Note. 4
Note. 5