Johnson Controls FAC4911 User Manual

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
24 AWG 3-pair CAT3 cable <30.5
m (100 ft)
Ethernet
(Ports)
ETH1
ETH2
Connect to BACnet/SC or 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.
FAC4911 Advanced Application Field Equipment Controller Installation Guide10

Johnson Controls FAC4911 Specifications

General

Brand	Johnson Controls
Model	FAC4911
Category	Controller
Language	English