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Document 15949 Rev. E 4/12/95 P/N 15949:E
3.7 The Control Module
The CMX-2 control module is an addressable module that supervises and switches power
to a notification appliance circuit. The CMX-2 circuit can be wired as an NFPA Style Y or
Style Z notification appliance circuit. Alternately, the CMX-2 can be employed as a Form-C
control relay.
Communications Loop Connections
Connect the communications loop to CMX-2 Terminals 1(-) and 2 (+). The CMX-2 occupies
one module address on the loop. Set the rotary switches on the CMX-2 to the particular loop
address required.
NFPA Style Y Notification Appliance Circuit
Connect polarized alarm notification appliances to a single 2-wire circuit. This circuit cannot
be T-tapped or branched in any fashion and must be terminated across the last device by a
47K, 1/2-watt ELR (Part No. A2143-00). Connect the circuit to CMX-2 Terminals 6 (+) and 7
(-). See Figure 3-16.
NFPA Style Z Notification Appliance Circuit
Connect polarized alarm notification appliances to a single two-wire circuit. This circuit
cannot be T-tapped or branched in any fashion. No external ELR is required for Style Z
wiring. Connect the 4-wire circuit to CMX-2 Terminals 6 (+) and 9 (+), then 7 (-) and 8 (-).
See Figure 3-17.
Notification Appliance Power
Connect notification appliance power to CMX-2 Terminal 3 (common) and Terminal 4 (+ 24
VDC). This power must be provided by a UL listed power-limited supply and must be super-
vised by a UL listed power supervision relay, wired as illustrated in Figures 3-16 or 3-17.
CMX-2
(Alarm polarity shown)
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