Specifications

8 C2985M-A (3/11)
CONNECTING A RELAY DEVICE
The ALM-1 has four outputs for activating external devices. It supports both momentary and continuous
relay operation.
You can operate the relays interactively during an active connection, or they can operate automatically to
coincide with certain events. Typical applications include turning on lights or other electrical devices or
activating a door, gate, or lock.
CONNECTING ALARMS
The ALM-1 provides four alarm inputs for external signaling devices, such as door contacts or motion
detectors. Both normally open and normally closed devices are supported.
Supervised Alarms
When an alarm is configured as a supervised alarm, the ALM-1 maintains a constant electrical current
through the alarm circuit (3.3 VDC, 1 kohm). If the alarm circuit length changes, due to an electrical short
or a bypass, the voltage fluctuates from its normal state and activates an alarm.
NOTE: Install the 1-kohm resistor as close to the switch as possible.
Figure 4 illustrates the alarm and no alarm conditions of a supervised alarm input. Whether the alarm is
normally closed or normally open, neither a cut nor a bypass can defeat these alarms.
Figure 4. Supervised Alarm Conditions
WARNING: Do not exceed the maximum relay ratings of 40 V, 2 A, or 60 W.
+V
+V
+V
+V
+V
+V
+V
+V
BYPASS
CUT
BYPASS
CUT
1 KΩ
1 KΩ
1 KΩ
1 KΩ
1 KΩ
1 KΩ
1 KΩ
1 KΩ
GND
ALARM
GND
ALARM
GND
NO ALARM
GND
ALARM
GND
ALARM
GND
ALARM
GND
NO ALARM
GND
ALARM
NORMALLY OPENNORMALLY CLOSED