S300 Expansion Enclosures CK721-A Installation and Operation
3-48 24-10349-8 Rev. B
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2012 Johnson Controls, Inc.
Wiring Input/Output Devices
Table 3-23: Cabling Requirements
Signal Type
Type
(
Stranded, Insulated)
Mfr./PN
Maximum
Leng
th
Alarm Input 1 twisted, shielded pair, ï€
#22 AWG to each detector
Belden 8761 500 ft (152 m)
Output Relay 1 twisted, shielded pair, ï€
#18 AWG to each relay
Belden 8760 Depends on load
The maximum distances between the S300 expansion enclosure and input or output
devices can vary and depend on:
 The current/voltage of the device
 The gauge wire you use
The rule is a maximum of 500 feet (152 meters). This ensures the integrity of the
current or voltage between the system an
d the input device.
The distance from a S300 expansion enclo
sure to an output device, and the
resistance of the wire, must not reduce the current or voltage to the output device by
more than 10 percent.
Expansion Enclosure Tamper Switch Wiring
The tamper switch on an expansion enclosure must be wired to an input point
located on a terminal. It must then be defined as an alarm when programming the
system. Consequently, expansion enclosures that only contain reader modules must
have the tamper switch wired back to the panel or to an input terminal located in
another expansion enclosure.
Unsupervised Alarm Inputs
Unsupervised alarms monitor two circuit conditions: alarm and secure.
Depending on the type of modules you have in
stalled, there are two-state or
four-state inputs. TheSI8 and SIO8 modules provide four-state alarms, and the I16
and IO8 modules provide two-state alarms.
Alarm devices are wired to both two and four-state
inputs in the same way. The
difference between two and four-state alarms is the use of resistors on the four-state
input at the alarm device end. Resistance is monitored by the CK721-A for open,
short, alarm, and secure conditions.
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