Digital Inputs
General
Type
.............................................
2 Dry-contact inputs with End-of-line (EOL)
Sensing and 2 Dry-contact inputs without End-
of-line (EOL) Sensing.
Detection Resistance Range
......
< 2 kOhm.
Protection Range
.........................
+15 V continuous.
Figure 1: End-of-line (EOL) Sensing Circuit
NOTE:
End-of-line (EOL) Sensing enables the WRM to raise an alarm when
somebody tampers with the circuit (cutting or shorting the wires) between
either Reader 1 Inputs [1] DOS or Reader 2 Inputs [2] DOS and GROUND
(GND). In other words the Module distinguishes between tampering on the
circuit, and the door being in an actual ‘Normally Open’ state.
By placing Resistors into the circuit between either Reader 1 Inputs DOS [1]
or Reader 2 Inputs DOS [1] and GROUND (GND), the Module’s Digital Input
monitors a constant resistance through the circuit. When the circuit is
tampered with, the Resistors are bypassed; the Module detects the
resistance change and raises an alarm.
LED Status and Diagnostic Indicators
Status LED (RED)
Supply Voltage Status ............ Off when supply voltage is too high, or too low
Upgrade Mode ....................... Flashing at a steady rate during upgrade
Communications Failure ........ Two brief flashes, repeating
Data LED (GREEN)
Flashing Green during communication
Digital Inputs (1-4)
......................
Continuous Green on detected contact closure
Relays (1 and 2)
...........................
Continuous Red on activation of the Relay
HMW300-0-0-GB-00
October 2013
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