Johnson Controls Metasys FAC4911 Installation Manual page 11

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 Terminal labels
label
+
-
COM
SA BUS
SA PWR
Sensor
Sensor
(Port)
Ethernet ETH1
ETH2
(Ports)
HOT
24~
COM
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.
Function, electrical ratings/
requirements
SA Bus Communications
SA Bus Signal Reference and 15 VDC
Common
15 VDC Supply Power for Devices on
the SA Bus
(Maximum total current draw for SA
Bus is 240 mA.)
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
Connect to BACnet IP Network
24 VAC Power Supply - Hot
Supply 20–30 VAC (Nominal 24 VAC)
24 VAC Power Supply Common
(Isolated from all other Common
terminals on controller)
14 VA
FAC4911 Advanced Application Field Equipment Controller Installation Guide
Recommended cable type
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.
24 AWG 3-pair CAT3 cable
<30.5 m (100 ft)
Ethernet ports; 10/100 Mbps;
8-pin RJ-45 connector
0.8 mm to 1.0 mm
(18 AWG) 2-wire
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