Johnson Controls NXA-FCU-01 Installation Manual page 11

2. Connect the other lead of the twisted pair to NET- on the FCU-01
board.
The network connections (Daisy Chain and T-Tap) to the FCU-01 are shown
in Figure 4 below:
NOTE: Doubly-terminated bus topology provides maximum wiring
distance. To achieve this, T-Tap wiring is allowed, but Daisy
chain wiring is preferred (Figure 4). If the T-Tap exceeds the
specified length (6 inches), then free topology wiring rules
apply.
“Daisy chain”
wiring example
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Figure 4. Network Wiring to FCU-01.
FCU Controller
LON From
Previous Device
LON To
Next Device
“T-Tap”
wiring example
J10
Note:
T-Tap length must not
exceed 6 inches.
Installation Guide
LON From
Previous Device
LON To
Next Device
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