Communications bus and supply power
wiring guidelines
Table 5 provides information about the functions, ratings,
and requirements for the communication bus and supply
power terminals. The table also provides guidelines for
wire sizes, cable types, and cable lengths for wiring the
controller's communication buses and supply power.
Important: Refer to the N2 Modernization Guide for
Legacy N2 Controllers (LIT-12012005) for guidelines
when you use this device on an N2 bus.
In addition to the guidelines in Table 5, observe the
following guidelines when wiring an FC Bus, SA bus or the
24 VAC supply power:
• Run all low-voltage wiring and cables separate from
high-voltage wiring.
• All FC and SA bus cables, regardless of wire size, should
be twisted, insulated, stranded copper wire.
• Shielded cable is strongly recommended for all FC and
SA bus cables.
• Refer to the MS/TP Communications Bus Technical
Bulletin (LIT-12011034) for detailed information
regarding wire size and cable length requirements for
FC and SA buses.
Communications bus and supply power terminal blocks, ratings, and requirements
Table 5: Communications bus and supply power terminal blocks, functions, ratings, requirements, and cable
guidelines
Terminal block/
Port label
Terminal
labels
Function, electrical ratings/Requirements Recommended cable type
+
-
FC Bus Communications
COM Signal Reference (Common) for Bus communications
FC BUS
SHD Isolated terminal
0.6 mm (22 AWG) stranded, 3-wire
twisted, shielded cable recommended
FC BUS (Port) FC Bus
RJ-12 6-Position Modular Connector provides:
• FC Bus Communications
• FC Bus Signal Reference and 15 VDC Common
• 15 VDC, 180 mA, Power for MAP Gateway or ZFR (or ZFR
Pro) Wireless Router
24 AWG 3-pair CAT 3 Cable <30.5 m
(100 ft)
+
-
SA Bus Communications
COM SA Bus Signal Reference and 15 VDC Common
SA BUS
POWER
15 VDC Supply Power for Devices on the SA Bus
(Maximum total current draw for SA Bus is 240 mA.)
0.6 mm (22 AWG) stranded, 4-wire
(2 twisted-pairs), shielded cable
recommended.
Note: The + and - wire are
one twisted pair, and the COM
and SA POWER are the second
twisted pair of wires.
SA BUS (Port)
SA BUS
RJ-12 6-Position Modular Connector provides:
• SA Bus Communications
• SA Bus Signal Reference and 15 VDC Common
• 15 VDC Power for devices on the SA Bus
24 AWG 3-pair CAT3 cable <30.5 m
(100 ft)
HOT
24 VAC Power Supply - Hot
Supplies 20–30 VAC (Nominal 24 VAC)
24V~
COM
24 VAC Power Supply Common (Isolated from all other
Common terminals on controller)
14 VA
0.8 mm to 1.0 mm
(18 AWG) 2-wire
< 30 m (100 ft)
Note: See Input and Output wiring guidelines to
determine wire size and cable lengths for cables
other than the recommended cables.
Note: The FC bus and SA bus wiring
recommendations in this table are for MS/TP
Bus communications at 38.4k baud. For more
information, refer to the MS/TP Communications Bus
Technical Bulletin (LIT-12011034).
M4-CGM General Purpose Application Controller Installation Guide 9
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