Grass Valley NV7512 v.1.3 - Manual (Page 82)

72 Rev 1.3 • 10 Oct 08
2. Installation
Making Alarm Connections
4 On the rear of the router, locate the ‘ALARMS’ connection, as shown in Figure 2-33.
Figure 2-33. Alarms Connection (Rear View)
5 Connect to the ‘ALARMS’ connection using a DE9 connector and serial cable.
6 Connect the other end of the cable to an external alarm indicator. See
Router Alarms on page 73
for information on wiring the DE9 connector.
Alarm Indicator Equipment
An external alarm indicator can be created to display visual cues when a failure has occurred on the
NV6257 power supply or the NV7512 router frame. LEDs can be wired to specific pins on a DE9
or DB25 connector. Each LED indicates what specific router module has failed.
• For NV6257 alarms, see NV6257 Alarms on page 72.
• For NV7512 alarms, see Router Alarms on page 73.
NV6257 Alarms
The ‘Alarms’ connection on the rear of the NV6257 uses a DB25 connector. An “alarm” or ON
condition occurs when the connection between an alarm pin and Alarm_COM (common) opens.
The alarm turns OFF when the connection between Alarm_COM and the alarm pin closes again. If
a PS6000 power supply module is removed, the alarm circuit remains open.
To create an indicator box, connect to the ‘Alarms’ connection using a DB25 female connector,
wiring as shown in Figure 2-34. Each pin monitors a specific function and activates a specific
alarm.
ALARMS
System Alarm
Connection