The CCFC is shipped from the factory with a pull down resistor connected to the External Trigger
and the External Trigger set to Active High. With this default setting, when no signal is applied to
the input, the External Trigger is inactive. A positive voltage is required to change to the active
state.
A capture is triggered by the transition from the inactive state to the active state. The minimum
required pulse period is 10 milliseconds (msec). Preferably, pulses should be short in duration
(milliseconds). No less than 1 sec between captures is recommended with no more than 5 in a 10
second period.
The voltage levels are:
l
Low Level: <0.65 V (-20 VDC Absolute Min)
l
High Level: >2.0 VDC (+20 VDC Absolute Max)
Leaving the External Trigger signal in the active state prevents the camera from entering into a
low powered state. If an external device is allowed to keep the camera in its Fully On State, power
consumption will be greatly affected.
When the camera is fully on and no other process is occurring, the time from the transition of the
signal from inactive to active to the time a picture is captured or video is started is typically less
than 100 msec. The parameter descriptions for the External Trigger setup are outlined in
(p. 51) and
(p. 53), respectively.
FIGURE 14-11. External Trigger: Create New Profile
CCFC Field Camera
50
