Communications Bus and supply power terminal blocks, ratings, and
requirements
Table 5: Communications 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
SA PWR
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 PWR
are the second twisted
pair of wires.
Sensor
(Port)
Sensor
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 and BTCVT
24 AWG 3-pair CAT3 cable
<30.5 m (100 ft)
Ethernet
(Ports)
ETH1
ETH2
Connect to BACnet IP Network
Ethernet ports; 10/100 Mbps;
8-pin RJ-45 connector
HOT
24 VAC Power Supply - Hot
Supply 20–30 VAC (Nominal 24 VAC)
24~
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
Note: The SA Bus wiring recommendations are
for MS/TP bus communications at 38.4k baud.
For more information, refer to the .
Note: The MAP Gateway serves as a
replacement for the BTCVT, which is no longer
available for purchase, but continues to be
supported.
FAC4911 Advanced Application Field Equipment Controller Installation Guide 11
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