Document #15668 Rev. I 04/20/98 P/N 15668:I
35
The M300 Monitor Module
2.9
The M300 Monitor Module
The M300 Monitor Module is an addressable module that monitors normally-open contacts and shorting-type alarm
initiating devices. The supervised module circuits can be wired as NFPA Style B or Style D Initiating Device Cir-
cuits. There is no limit to the number of contact-type devices installed on a monitor module circuit. Refer to Figure
2-19, “Style B Circuit using M300,” on page 37 and Figure 2-20, “Style D Circuit using M300,” on page 38, for wir-
ing diagrams.
Communications Loop Connections
Connect the MS-9200 Communications SLC loop to M300 Terminals 1(-) and 2(+). The M300 occupies one module
address on the loop. Use the rotary switches on the M300 to set the module to the required loop address.
NFPA Style B Initiating Device Circuit
Connect the normally-open contacts of the alarm initiating devices to a single 2-wire circuit as illustrated in Figure 2-
19, “Style B Circuit using M300,” on page 37. Note that this circuit cannot be T-tapped or branched in any fashion
and must be terminated across the last device by a listed ELR. Connect the circuit to M300 Terminals 6(-) and 7(+).
NFPA Style D Initiating Device Circuit
Connect the alarm initiating devices to a single 4-wire circuit as illustrated in Figure 2-20, “Style D Circuit using
M300,” on page 38. Note that this circuit cannot be T-tapped or branched in any fashion. Connect the 4-wire circuit
to M300 Terminals 6(-) and 9(-), then 7(+) and 8(+).
Test Switch
The M300 includes a magnetic test switch located near the center front of the module. Activation of this switch will
cause an open circuit indication in the Style B/D loop.
2.10 The M301 Monitor Module
The M301 Monitor Module is an addressable module that is functionally and electrically identical to an M300 Moni-
tor Module (Style B circuits only), but offered in a smaller package for mounting directly in the electrical box of the
contact-type device being monitored.
The M300 and M301 Monitor Modules incorporate the following features:
1.
The Initiating Device Circuit is supervised and current-limited to 230 uA @ 24 VDC (nominal).
2.
The Initiating Device Circuit wiring may be up to 2,500 feet (760 m) or a maximum of 40 ohms for the M300
and 20 ohms for the M301.
3.
The Initiating Device Circuit provides the following services (DO NOT MIX):
✓
Fire Alarm Service
✓
Automatic/Manual Waterflow Alarm Service with normally-open contact devices
✓
Sprinkler Supervision with normally-open contact devices
4.
The maximum SLC loop resistance, due to wiring, is 40 ohms.
Module address is set
with these switches
Loop (-)
(black)
Loop (+)
(red)
IDC (-)
(yellow)
IDC (+)
(violet)
NFPA Style B Initiating Device Circuit
Terminate with a 47K ohm, ½ watt ELR
(N-ELR in Canada).
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