User Manual
Chapter 4 - Operation and Administration Using the CLI NPU Configuration
4Motion 450 System Manual
4.3.14.4 Managing Dry-contact Input Alarms
Dry-contact input alarms are external devices that are connected to the 4Motion
unit, and notify the system when there is a change in external conditions. When
the system receives this notification, an SNMP trap is sent to the EMS. For
example, a device such as a temperature sensor that is connected to the 4Motion
unit, and configured to function as a dry-contact input alarm, can raise an alarm
to the system when there is a sudden change in the room temperature. The
system then sends an SNMP trap to the EMS, notifying the administrator of the
change indicated by the external device.
Dry contact input alarms are connected to the 4Motion system via a 25-pin micro
D-Type ALRM-IN/OUT connector on the NPU front panel. The following figure
depicts the ALRM-IN/OUT connector, and the pin numbers assigned to each pin:
Figure 4-2: 25-pin Micro D-Type ALRM-IN/OUT Connector
You can configure upto eight dry contact input alarms, each mapping to a
different pin number. This section describes the commands to be executed for:
“Mapping a Dry-contact Input Alarm to an Alarm Condition” on page 450
“Disabling Dry-contact Input Alarms” on page 454
4.3.14.4.1 Mapping a Dry-contact Input Alarm to an Alarm Condition
Dry contact alarms are connected to the 4Motion unit via the 25-pin micro D-Type
ALRM-IN/OUT connector on the front panel of the NPU. You can configure upto
eight dry contact input alarms, each connected to a different pin on the
ALRM-IN/OUT connector. Each alarm can then map to any of the following alarm
conditions. If the external dry-contact alarm detects that any of these conditions
is fulfilled, an alarm is raised, and a corresponding trap is sent to the EMS.