Communications bus and supply power terminal
blocks, ratings, and requirements
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
+
-
FC Bus Communications
COM
Signal Reference (Common)
for bus communications
FC BUS
11
SHLD
Isolated terminal (optional
shield drain connection)
0.6 mm (22 AWG)
stranded, 3-wire
twisted, shielded cable
recommended
FC BUS (Port)
1
FC BUS
RJ-12 6-Position Modular
Port provides FC Bus
Communications.
FC Bus provides 15 VDC
Power for:
• Wireless Bluetooth
Commissioning Converter
(BTCVT)
22
• Wireless ZigBee Field Bus
Router
24 AWG 3-pair CAT 3 Cable
<30.5m (100 ft)
21F4-CVM VAV Terminal Equipment Controllers Installation Instructions
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