Apex Digital K1106 Wiring an Input Using an End-of-Line Resistor, Wiring an Input Using No End-of-Line Resistors, Wiring an Input Using 2 End-of-Line Resistor Supervision

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Two Resistor Supervision: This wiring arrangement allows the system to detect and handle open loops and shorts as
a trouble condition. Through programming, trouble conditions can be communicated to
the central station and show trouble status on a keypad.
Wiring an Input Using an End-of-Line Resistor
Normally Closed Normally Open
4.7KΩ
4.7KΩ
Single E.O.L Resistor: Traditional inputs are wired with a single end-of-line resistor. An open or short is treated
as an open. A single end-of-line resistor is only effective if the resistor is placed after the
last device wired in an input loop. This is the only suitable wiring method for smoke
loops.
No End-of-Line Resistor: The option is recommended only for "non-perimeter" zones that do not require tamper
protection. There is no tamper protection (other than a cut loop shows an open) without a
resistor and all loops that do not use a resistor must be normally closed. No End-of Line
Resistor is not permitted in a UL installation.
Wiring an Input Using No End-of-Line Resistors
Normally Closed
All inputs that do not use end-of-line resistors
must be wired with a normally closed sensor
Wiring an Input Using 2 End-of-Line Resistor Supervision
Normally Closed Normally Open
4.7KΩ
4.7KΩ
4.7KΩ
4.7KΩ
Only use 1 End-of-Line Resistor on smoke detector loops.