impro IMPROX TRT, Руководство по установке

Страница: 2 / 20

Power Output
System Battery
Relays
Digital Inputs
Figure 1: End-of-line (EOL) Sensing Circuit
NOTE: End-of-line (EOL) Sensing enables the Terminal to raise an alarm when
somebody tampers with the circuit (that is, cutting or shorting the wires)
between Input 1 (of DOS [1] or DOS [2]) and
‘ ’ GROUND (GND).
In other words the Terminal distinguishes between tampering on the circuit,
and the door being in an actual ‘Normally Open’ state.
By placing Resistors into the circuit between the Input 1 (of DOS [1] or DOS
[2]) and ‘
’ GROUND (GND), the Terminal’s Digital Input monitors a
constant resistance through the circuit. When the circuit is tampered with,
the Resistors are bypassed; the Terminal detects the resistance change
raising an alarm.