GRASS VALLEY NV9680, Руководство пользователя

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18
GPIO
Input
Input
The tally inputs expect contact closure to ground, through the ground pins on the
connector, to trigger a GPI input event.
Fig. 5-2: GPI Input
When the input transitions off or transitions on, the NV9680 notifies the GV - Orbit Server,
which carries out the task defined for the input (if a task has been configured).
During contact closure, a current of 1.2mA flows. A maximum of 48VDC can be applied to
the tally input for less than 5 seconds without failure. No voltage above 5VDC should be
continuously applied.
Output
A tally output is a solid state relay (no audible click) with a maximum resistance of 10  and
current capability of 150mA. It can withstand 200VAC.
Fig. 5-3: GPI Output
When a condition (defined for the relay) occurs, GV - Orbit Server notifies the NV9680 which
then opens or closes the relay. The relay switches the connected circuit on or off. This does
not power the circuit. You must provide a power source for the circuit.
+5V
Optical
Isolation
C
E
+5V
Tally Input n
to internal bus
10K
Customer’s
Switch (or
Equivalent
Logic)
Optical
Isolation
Customer’s Load
–
+5V
499
+
from internal bus
Tally Output n
V
Optional Grounding