76
GPIO
Output
When the input transitions off or transitions on, the NV9641 notifies the router control
system, which carries out the task defined for the input (if a task has been configured).
During contact closure, a current of 1.2 mA flows. A maximum of 48 VDC can be applied to
the tally input for less than 5 seconds without failure. No voltage above 5 VDC should be
continuously applied.
Output
A tally output is a solid state relay (no audible click) with a maximum resistance of 10
Ω
and
current capability of 150 mA. It can withstand 200 VAC.
Fig. 6-3: GPI Output
When a condition (defined for the relay) occurs, the router control system notifies the
NV9641 which then opens or closes the relay. The relay switches the customer’s circuit on or
off. (It does not power the circuit. Customers must provide their own power.)
GPIO Configuration Concepts
These are the I/O characteristics of the NV9641’s tally interface:
•
Eight optically isolated inputs (sometimes called GPIs) that can be configured to trigger
an event when the input transitions from off to on and to trigger another event on a
transition from on to off. Events include:
•
Execute a salvo.
•
Route the “previous source” switched by
any
panel to a destination.
•
Route the “previous source” switched by
this
panel to a destination.
•
Route a source to a destination.
•
Four relays that can be configured to switch on a number of conditions:
•
One or more routes occurring on specific levels.
•
Conditions involving output ports (destination, level).
•
A transition on one or more of the panel’s tally inputs.
The pinout of the NV9641’s connector might differ from the pinout of other control
panels.
Optical
Isolation
Customers Load
+5V
499
+
from internal bus
Tally Output
n
V
Optional Grounding
