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Chapter 6 provides information about the tally (GPIO) interface.
Summary
The Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
GPIO Configuration Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Configuring Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Configuring Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
The Interface
The tally interface includes 8 optically isolated inputs and 4 solid-state relay outputs (also
optically isolated). Tally devices you connect to inputs can trigger events — through the
NV9649 — in the router control system. The router control system can trigger events that —
through the relays in the NV9649 — switch your tally devices.
The DB25 connector, labeled "GPI Interface" at the rear of the NV9649 presents the tally
signals. There are 8 input signals and 4 pairs of output signals.
1 0
3 2 5 4
Fig. 6-1: GPI Interface
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. 6-2: GPI Input
13
25
7 6
1 0
3 2
5 4
Inputs
+5V
+5V
C
Tally Input n
E
Optical
Isolation
Ground
1
14
– +
+ –
– +
+ –
7 6
0
1
2
3
Outputs
10K
to internal bus
GPIO
14
– +
+ –
– +
+ –
6
0
1
2
3
129
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