York YD480 Series Installation Manual page 28

5012886-YIM-B-0517
Table 9: Smart Equipment™ UCB Details (Continued)
ENTER
CANCEL
JOY
J10
FC+
FC–
COM
SHLD
EOL
switch
EOL
FC BUS
ISO PWR
28
Description
Button for display menu acknowledgment and
navigation
Button for display menu navigation and zeroing of
active compressor ASCD timer
4-way Joystick for display menu navigation
Item USB connector at right of UCB
Type A female Universal Serial Bus connector
Optional communication sub-board at center of UCB
Terminal FC BUS connections on left edge of the communication board
FC ("Field Connected") BUS BACnet MSTP
communication
FC ("Field Connected") BUS BACnet MSTP
communication
Common for the FC ("Field Connected") BUS
BACnet MSTP communication circuit
Shield for the FC ("Field Connected") BUS
BACnet MSTP communication circuit
Item Selector in red housing at left on top edge of the communication board
End Of Line selector switch for the FC BUS
BACnet MSTP communication circuit
LEDs on the communication board
Green End Of Line indicator
Green FC bus communication transmission
indicator
Green communication board Isolated Power
indicator
Function & Comments
Used for backup, restoration, & copying of board parameters as
well as board software updating through a flash drive
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
Johnson Controls Unitary Products