Section 2: Installation
Normally closed
Connect hardwired devices to any Z terminal and any COM terminal. Wire normally closed devices in series.
Note:
For UL Installations, do not use normally closed loops.
Figure 2-29 Normally closed
The following table shows zone status under certain conditions for NC Loops:
Table 2-5 NC loop status
Loop resistance
Loop status
0
Ω
(shorted wire, loop shorted)
Secure
Infinite (broken wire, loop open)
Violated
Single end-of-Line (SEOL) resistor
When SEOL resistors are installed at the end of a zone loop, the alarm panel detects if the circuit is secure, open, or shorted.
The SEOL resistor must be installed at the end of the loop for proper supervision.
To enable SEOL supervision, program section [013], options [1] and [2] to OFF. To configure SEOL supervision per zone,
use programming section [002], bit 10.
Note:
This option should be selected if either normally closed or normally open detection devices or contacts are used.
Figure 2-30 SEOL wiring
The following table shows zone status under certain conditions for SEOL:
- 36 -
