Campbell Scientific CC5MPX and CC5MPXWD Digital Network Cameras - Manual (Page 68)

Section 7. Camera Operation Using Web Browser Interface
7-32
7.6.3 Self Timed Capture2
Refer to the previous section as the settings and parameters are the same.
7.6.4 External Trigger
The External Trigger sub tab (see FIGURE 7-30) is used to configure the
camera to capture still images or video by using an external signal that is
applied to the External Trigger input line.
The External Trigger can be configured for an active HIGH signal or an active
LOW signal (see Digital I/O Settings). The Capture is triggered by the
transition from the inactive state to the active state. The minimum required
pulse period is 10 mSec. Preferably pulses should also be short in duration
(only a few seconds). The voltage levels are as follows:
Low Level: < 0.65V (-20VDC Absolute Min)
High Level: >2.0 VDC (+20VDC Absolute Max)
Leaving the signal on the External Trigger in the active state will prevent 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 taking place, 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 description of the parameters for the External Trigger setup are outlined in
TABLE 7-8.