• Follow the transformer manufacturer’s instructions
and the project installation drawings. Power supply
wire colors may be different on transformers not
manufactured by Johnson Controls.
• While connecting network devices to 24 VAC power,
make sure that transformer phasing is uniform across
all devices. Powering network devices with uniform 24
VAC supply power phasing reduces noise, interference,
and ground loop problems.
Connecting MS/TP or N2 bus devices
To connect devices to the MS/TP Field Controller (FC) Bus
or N2 Bus, complete the following steps:
1. Connect the 3-wire bus cable to the removable blue
4-pin terminal block labeled FC-A as shown in Figure
7.
Note: The FC-A and FC-B terminals can accept
either the MS/TP FC Bus or the N2 Bus, but not a
mixture of both on the same trunk. If you want
to integrate both the MS/TP Bus and the N2
Bus, select one FC terminal for MS/TP FC Bus
use and the other for N2 Bus use.
Figure 7: FC Bus terminal block and wiring connections
Table 2: FC Bus terminal block wiring
Callout Description
1 FC Bus terminal block
2 FC Bus terminal block plug
3 Terminating wires (3-wire cable shown)
2. To add additional field devices, wire from one device
to the next as shown in Figure 8. Do not connect
more than two wires to each terminal to ensure that
a daisy chain configuration is used.
Figure 8: Daisy chained devices
Table 3: FC Bus terminal block wiring
Callout Description
1 Daisy-chained device on FC Bus segment
2 Terminating device on FC Bus segment
3 FC Bus terminal plugs
4 To next device on FC Bus segment
5 From previous device on FC Bus segment
6 Isolated shield connection terminal
3. Set each FC EOL switch to their proper positions. See
the note in Setting the end-of-line switches.
NAE55 Installation Guide8
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