Miranda NV8256-Plus, User Manual

Page: 64 / 88

54 Rev 1.3 • 29 Mar 09
4. Operation
Setting Redundant Crosspoint Card Switching
•
Remote Control
— allows external remote control of the redundant crosspoint card. For
information on remote control, see Using Remote Control , following.
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-
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 < 50 W )
1
13
14
25
4
5
6
7
Center Crosspoint
(Redundant)
Right Crosspoint
(Outputs 129–256)
Remote Panel Enable