Grass Valley NV8256-Plus v.1.2 - Manual (Page 66)

56 Rev 1.2 • 20 Oct 08
4. Operation
Setting Redundant Crosspoint Card Switching
For more information on which signals are controlled by which crosspoint card slot, see Cross-
point Card Slots and Managed Signals on page 5.
3 The selected function will remain active until another button is pressed and a new function
selected.
Using Remote Control
The redundant crosspoint card can be controlled remotely by creating an external circuit. To create
the circuit, use momentary switches with a series resistance of 50
Ω or less. The switches should be
connected in parallel with an LED cathode attached to ground (GND). The output signals are nom-
inally +3.3
V. The selected diode should have a maximum forward bias current of 10 mA and maxi-
mum forward bias voltage of 1.5–2.2 V.
Figure 4-2 shows the remote control connector pinout and required circuit.
Figure 4-2. Redundant Crosspoint Card Connector
Left crosspoint
(Outputs 1–128)
Momentary Switches
(Series Resistance < 50W)
1
13
14
25
4
5
6
7
Center Crosspoint
(Redundant)
Right Crosspoint
(Outputs 129–256)
Remote Panel Enable