Table 5: Communication bus and supply power terminal blocks, functions, ratings,
requirements, and cables
Terminal block/Port
label
Terminal
labels
Function, electrical
ratings/Requirements
Recommended cable
type1
1
FC BUS FC BUS RJ-12 6-Position Modular
Port provides FC Bus
Communications
FC Bus provides 15 VDC
Power for:
• Wireless Bluetooth
Commissioning Converter
• Wireless ZigBee Field Bus
Router
24 AWG 3-pair CAT 3 Cable
<30.5m (100 ft)
SA BUS
2
SA BUS RJ-12 6-Position Modular
Port provides SA Bus
Communications
SA Bus provides 15 VDC
Power for:
• NS Series Sensors
• Wireless ZigBee FX-
ZFR-7860 Series One-to-
One Wireless Receiver
• Bluetooth Commissioning
Converter (FX-BTCVT)
• FX-DIS1710 Local
Controller Display
• FX-ATV 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 -0 models isolate this
terminal from all other
commons.
The -1 models only isolate
this terminal from the FC
bus common.
0.8 mm to 1.0 mm
(20 to 18 AWG) 2-wire
1 See Table 4 to determine wire size and cable lengths for cables other than the recommended cables.
2 The SA Bus and FC Bus wiring recommendations in this table are for MS/TP Bus communications at 38.4k baud. For
more information, refer to the FX-PC Series Controllers MS/TP Communications Bus Technical Bulletin (LIT-12011670).
19FX-PCV1615/1626/1628/1630 Programmable VAV Box Controllers Installation Instructions
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