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Table 5:
Digital Input Characteristics
Parameter
V
alue
Operating voltage
0—24 V
Input current
7.5 mA
External resistor requirement No
ON voltage level
> 3.3 V
OFF voltage level
< 0.5 V
OFF to ON delay
< 4 us
ON to OFF delay
< 40 us
Note:
For external trigger application a rising edge signal is recommended to minimize the time it takes for the
optocoupler to change state.
Debouncing of the Trigger Input
When a trigger signal to the camera is generated by a mechanic switch, the switch contacts might
bounce off each other when it opens or closes. This bouncing action can produce transient signals that
do not represent a true change of state. In this case it is necessary to filter out transient signals using the
debouncing function of the trigger input port.
Figure 5:
Internal trigger delay with debounce filter
The figure above shows the operation of the debounce circuit. The debounce circuit will filter out signal
changes passed through the opto-coupler as long as the debounce filter is active. The debounce filter
duration is user-programmable up to 268µs.