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Smart Equipment™ UCB - LEDs
Location
Label
POWER Green UCB power indicator
Red hard lockout, networking error and firmware
FAULT
N
error indicator
Green UCB SA bus communication transmission
SA BUS
indicator
Smart Equipment™ UCB - optional communication sub-board
Location
Label
FC ("Field Connected") BUS BACnet MSTP
FC+
communication
1
O
FC ("Field Connected") BUS BACnet MSTP
FC–
Terminal FC
communication
BUS
connections
Common for the FC ("Field Connected") BUS
COM
BACnet MSTP communication circuit
Shield for the FC ("Field Connected") BUS
SHLD
BACnet MSTP communication circuit
EOL
End Of Line selector switch for the FC BUS
Q
switch
BACnet MSTP communication circuit
EOL
Green End Of Line indicator
P
Green FC bus communication transmission
FC BUS
indicator
Green communication board Isolated Power
R
ISO PWR
indicator
Johnson Controls Ducted Systems
Description
Description
Function and comments
Lit indicates 24 VAC is present at C and 24V terminals
1/2 second on/off flashing indicates one or more alarm is currently active,
1/10th second on/off flashing indicates a networking error (polarity,
addressing, etc.) or a firmware error (likely correctable with re-loading
from USB flash drive)
Lit/flickering indicates UCB SA bus communication is currently active, off
indicates the UCB is awaiting SA bus communication
Function and comments
Positive of the VDC (typically, a fluctuating 1.5 to 3.5 volts reading to
COM; at least 0.25 volts higher than –) FC bus BACnet MSTP
communication circuit
Positive of the VDC (typically, a fluctuating 1.5 to 3.5 volts reading to
COM; at least 0.25 volts lower than +) FC bus BACnet MSTP
communication circuit
Negative of the VDC FC bus BACnet MSTP communication circuit
Earth ground reference of the cable to prevent interference on the
FC bus BACnet MSTP communication circuit
ON selected only for the UCB that is the terminus of the FC bus
BACnet MSTP communication cable to prevent signal "bounce-
back"
Lit indicates the EOL switch is selected ON
Lit/flickering indicates outgoing UCB FC bus communication is
currently active, off indicates the UCB is awaiting incoming FC bus
communication
Lit indicates the UCB is supplying power to the communication sub-
board
5567611-BIM-B-1218
75
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