Fire-Lite Alarms MS-9200 Programming, Installation, Maintenance And Operating Instruction Manual page 33

Wiring the Signaling Line Circuit
Style 4 Two-Wire Communications Loop (supervised and Power-limited)
The 2-wire communication loop meets NFPA 72 Style 4 requirements and may be T-tapped.
FIGURE 2-11:
CAUTION! Do not
loop wiring under
any terminals. Break
wire run to maintain
supervision.
30
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Two-Wire Communications Loop
SD300
-
+
COM
NC
NO
C304
I300
Shield
A
T
B
1
6
Connect (+) to TB6-3
Connect (-) to TB6-5
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B B+ A+ B- A-
2 3 4 5 6
Document #15668 Rev.I 04/20/98 P/N 15668:I
BG-10LX
-
-
+
+
+
-
M300
Separate T-tap to
other loop devices.
I300
Note: I300 devices are
not required to meet
NFPA Style 4.