Grass Valley NV5256 v.1.8 - Manual (Page 24)

16 Rev 1.8 • 08 Jul 11
3. Detail
Alarms
A redundant reference uses identical, but distinct, reference signals. If one reference source
fails, the other acts as a fail-over.
S The NV5256 does not support “dual reference” mode.
If you have an expanded router, use the loop-through connector to connect the master and slave
frames. Terminate any reference chains with 75
Ω terminators.
Time Code Reference
At the lower left portion of the rear of the NV5256 frame are 2 connectors for time-code reference:
The NV5256 does not use time-code reference. You can ignore these connectors.
Alarms
Two alarm connectors (system, and power-supply) allow you to construct alarm indicator circuits
of your own.
System Alarm Outputs
At the lower left portion of the rear of the frame is a female DE9 connector for system alarms:
This connector allows you to create alarm circuits of your own.
The internal alarm signalling is provided by solid-state relays that turn on in the event of an alarm
condition. Table 3-1 describes the individual alarm connections:
ALARMS
TIMECODE
113-128
8
97-112
7
81-
6
145-160
10
161-176
11
177-192
12
193-208
13
209-224
14
225-240
15
241-256
16
129-144
9
PORTS
13-
PORT
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
Time-Code
Reference
ALARMS
TIMECODE 13-
PORT
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
13-16
PORT 16
Alarm
Connector
Table 3-1. Alarm Signals
Pin Signal Description Possible Alarm Condition(s)
1, 9 Alarm Com Common Common connection for all alarm signalling pins. This is a
“return” for an external circuit.
2 Alarm 1 Major alarm Missing reference inputs, possible failure of fans or over-
temperature conditions on one or more modules.
3 Alarm 2 Minor alarm Any of alarms conditions 3, 4, 5 or 6.
4 Alarm 3 Power supply Main power supply module is missing.
5 Alarm 4 Video reference Missing video reference signal 1 or 2 (if applicable).