Table 4: Communication bus and supply power terminal blocks, functions, ratings,
requirements, and cables
Terminal block/Port
label
Terminal
labels
Function, electrical
ratings/Requirements
Recommended cable
type
+
-
SA Bus Communications
COM
SA Bus Signal Reference and
15 VDC Common
SA BUS
1
SA PWR
15 VDC Supply Power for
Devices on the SA Bus
0.6 mm (22 AWG)
stranded, 4-wire (2
twisted-pairs), shielded
cable recommended
Note: The + and -
wires are one twisted
pair, and the COM
and SA PWR wires are
the second twisted
pair.
SA BUS (Port)
1
SA BUS
RJ-12 6-Position Modular
Port provides SA Bus
Communications.
SA Bus provides 15 VDC
Power for the following:
• NS Series Sensors
• MAP Gateway 4.2 or
above
• Wireless ZigBee FX-
ZFR-7860 Series One-to-
One Wireless Receiver
• Wireless Bluetooth
Commissioning Converter
(BTCVT)
2
• DIS1710 Local Controller
Display
• VAV Balancing Tool
24 AWG 3-pair CAT 3 Cable
<30.5m (100 ft)
HOT
24 VAC Power Supply - Hot
Supplies 20–30 VAC
(Nominal 24VAC)
24~
COM
24 VAC Power Supply
Common
The CVM models only
isolate this terminal from
the FC bus common.
0.8 mm to 1.0 mm
(20 to 18 AWG) 2-wire
1 The FC bus and SA bus wiring recommendations in this table are for MS/TP Bus communications at 38.4k baud.
2 The MAP Gateway serves as a replacement for the BTCVT, which is no longer available for purchase, but continues to be
supported.
F4-CVM VAV Terminal Equipment Controllers Installation Instructions22
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