Grass Valley NV8256-Plus v.1.2 - Manual (Page 60)

50 Rev 1.2 • 20 Oct 08
3. Installation
Making Alarm Connections
opens. The alarm turns OFF when the connection between Alarm_COM and the alarm pin closes
again.
To create an indicator box, connect to the ‘ALARM’ connection using a DE9 female connector,
wiring as shown in Figure 3-19. Each pin monitors a specific function and activates a specific
alarm.
Figure 3-19. Alarm Connections and On/Off Switches
The following lists each DE9 pin and the associated alarm. The pin number listed corresponds to
the pin numbers in Figure 3-19:
Typical Circuit 1
Customer-supplied relay
contacts NC, (but open during
alarm condition)
External Power,
30VDC max, 150mA max
Normally ON, the LEDs turn off to indicate failure
1
COM
Normally OFF, the LEDs turn on to indicate failure
30VDC max, 150mA max External Power
1
1 2 3 4 5
6 7 8 9
1
2
3
4
5 Alarm COM
Alarm 1
Alarm 2
Alarm 3
Alarm 4 8
7
8
9 Alarm 5
Alarm 6
Alarm 7
Alarm COM
Typical Circuit 2
COM
Pin Signal Description Possible Conditions Causing the Alarm
1, 9 Alarm_COM Common Common connection for all alarm pins.
2 Alarm_1 Major Alarm Indicates missing reference inputs, or missing power
supplies.
3 Alarm_2 Minor Alarm Alarm_3, or Alarm_4, or Alarm_5, or Alarm_6
4 Alarm_3 Power Supply Missing power supply module.
5 Alarm_4 Video Ref Missing Video Ref 1 or Video Ref 2.
6 Alarm_5 AES3 ref Not used in NV8256-Plus.
7 Alarm_6 Fans or temperature Indicates a fan failure or module over temperature.
8 Alarm_7 Control module health Any control module not “healthy.”