User Manual Part 2

Lynx.GX Installation and Management
IDU ALARM PORT CONNECTOR
External alarm outputs are provided using the 9-pin, D-type (DB-9) ALARM female connector. Two Form C
alarm relays capable of switching 30 VDC at 1A are provided. Both relays are energized in the normal state and
de-energized in the alarm state. The two relay alarms are:
▪ Major or “Out-of-Service” alarm is activated by any red alarm. This is also indicated by the “bar” alarm
indicator on the GUI.
▪ Minor or “Summary” alarm is activated by any yellow alarm except AIS OUT.
Two external relay inputs are available and can be set on the SysCfg page. By default, shorting the alarm pin
to ground (close condition) causes the external alarm to display on the web page or in SNMP. This can be
changed on the SysCfg page to make the open condition cause the alarm.
Note: All alarms are active for a minimum of one second, or as long as the alarm condition persists, which ever
is longer duration.
Figure 9. Alarm Plug Pin Assignment
Alarm Plug Connector Pin Assignment Description – Front View
Pin Description
1 NO, Minor Alarm, Form C: normally open connection. Closed when in alarm.
2 NC, Minor Alarm, Form C: normally closed connection. Open when in alarm
3 COMMON CHASSIS/SIGNAL GROUND.
4 NO, Major Summary Alarm, Form C: normally open connection. Closed when in alarm.
5 NC, Major Summary Alarm, Form C: normally closed connection. Open when in alarm.
6 Common, Minor Alarm, Form C: common connection on the minor alarm relay.
7 External Input Alarm 1 (used with NMS alarm and SNMP only)
8 External Input Alarm 2 (used with NMS alarm and SNMP only)
9 Common, Major Summary Alarm, Form C: common connection for the major summary alarm relay.
Appendix D Connectors and Pin Assignments 79