DSC HS2128 Reference Manual page 21

3.1.8 Zone Wiring
Power down the alarm controller and complete all zone wiring.
Zones can be wired to supervise normally open devices (e.g., smoke detectors) or normally closed devices (e.g., door con-
tacts). The alarm panel can also be programmed for single end-of-line or double end-of-line resistors.
Zone programming is done using the following programming sections:
[001] selects zone definition
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[013] Opt [1] for normally closed or EOL; Opt [2] for SEOL or DEOL
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[201 - 208] partition assignment.
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Observe the following guidelines when wiring zones:
For UL listed installations use SEOL or DEOL only
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Minimum 22 AWG wire, maximum 18 AWG
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Do not use shielded wire
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Do not exceed 100Ω wire resistance. Refer to the following table:
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Table 3-3 Burglary Zone Wiring Chart
Wire Gauge
22
20
19
18
Figures are based on maximum wiring resistance of 100 Ω.
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 3-6 Normally Closed
The following table shows zone status under certain conditions for NC Loops:
Table 3-4 NC Loop Status
Loop Resistance
0 Ω (shorted wire, loop shorted)
Infinite (broken wire, loop open)
Maximum Length to EOL Resistor (ft/meters)
Loop Status
Secure
Violated
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3000 / 914
4900 / 1493
6200 / 1889
7800 / 2377