Grass Valley NV8500 Series v.3.5 - Manual (Page 128)

112
Alarms
Making Alarm Connections
 Warning: do not reverse bias the alarm connections. They will not function and damage
might occur.
Circuit 2, in Figure 7-4, controls relays to drive higher loads, such as lamps or speakers, possibly
using AC.
The following lists each DE9 pin and the associated system alarm. The pin number listed corre-
sponds to the pin numbers in Figure 7-4:
On NV8140 and NV8144 routers, the power supply alarm connectors and the system alarm
connectors look alike. Be careful to use the correct connector.
Making Alarm Connections
System Alarm Connections
System alarm signals connect from the router frame directly to your alarm indicators. System
alarms are also sent by the control card to the router control system and display in MRC.
Making System Alarm Connections
1 At the rear of the router, locate the ‘ALARMS’ connector:
Fig. 7-5: System Alarm Connection on Router (Rear View)
2 Using a DE9 connector and cable suitable for your equipment, connect your alarm indicators
to the ‘ALARMS’ port of the router.
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 sup-
plies.
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 AES Ref Not used in NV8500 Series.
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.”
System Alarm Connector