Wiring an Input Using an End-of-Line Resistor

 

 

 

 

 

4.7KΩ

 

 

 

 

 

 

 

 

 

4.7KΩ

 

 

 

 

 

 

 

 

 

 

 

 

 

Normally Closed

Normally Open

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.

 

 

 

 

Wiring an Input Using 2 End-of-Line Resistor Supervision

Ω 4.7KΩ 4.7K

Normally Closed

Ω4.7K 4.7KΩ

Normally Open

Only use 1 End-of-Line Resistor on smoke detector loops.

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 No End-of-Line Resistors

All inputs that do not use end-of-line resistors must be wired with a normally closed sensor

Normally Closed

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.

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Apex Digital K1106 Wiring an Input Using an End-of-Line Resistor, Wiring an Input Using 2 End-of-Line Resistor Supervision
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K1106 specifications

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