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GPIO
Input
Input
The tally inputs expect contact closure to ground, through the ground pins on the
connector, to trigger a GPI input event.
Customer’s
Switch (or
Equivalent
Logic)
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.
from internal bus
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.
18
+5V
C
Tally Input n
E
Optical
Isolation
+5V
499
+
Optical
Isolation
Tally Output n
–
+5V
10K
to internal bus
V
Customer’s Load
Optional Grounding
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