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 type
11
+
-
SA Bus Communications
COM
SA Bus Signal Reference and 15 VDC
Common
SA BUS
33
POWER
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.
TSTAT TSTAT
RJ-45 8-Position Modular Connector
provides +15 VDC Power for:
• Wireless Commissioning
Converter
• VAV Balancing Tool
• One-to-One Wireless Receiver
• Network Sensor
24 AWG 4-pair CAT 5 Cable <30.5 m
(100 ft)
HOT
24 VAC Power Supply - Hot
Supplies 20–30 VAC (Nominal 24 VAC)
24~
COM
24 VAC Power Supply Common
The terminal is isolated from the FC bus
common.
0.8 mm to 1.0 mm
(20 to 18 AWG) 2-wire
1 To determine wire size and cable lengths for cables other than the recommended cables, see Table .
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 MS/TP Communications Bus Technical Bulletin (LIT-12011034).
3 The SA bus wiring recommendations are for MS/TP Bus communications at 38.4k baud. For more information, refer to the MS/TP
Communications BusTechnical Bulletin (LIT-12011034).
VMA1617 and VMA1632 VAV Controllers Installation Guide12
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