Johnson Controls NAE55 Installation Manual page 8

Figure 9: Daisy chained devices
3. Set each FC EOL switch to their proper
positions. See the note in
switches.
Connecting LonWorks devices
To connect LonWorks devices, complete the
following steps:
1. Connect the 2-wire cable from the LonWorks
network trunk to the removable 3-terminal blue
plug labeled LON (Figure 4). The LonWorks
network trunk is available on the MS-NAE5520-3
model only.
Figure 10: LonWorks network terminal block and
wiring connections
2. To add additional vendor devices, wire from one
device to the next in a daisy-chained fashion.
Do not connect more than two wires to each
terminal.
8 NAE55/NIE55 Installation Guide
Setting the end-of-line
Connecting Modbus RTU devices
The NAE connects to Modbus RTU devices directly if
the RS485 protocol is in use or by using a converter
if the RS-232 protocol is in use. (After installation
and wiring are complete, refer to the Network
Engine Commissioning for Modbus Vendor Integration
Application Note (LIT-12013150) for additional
information.)
1. For a Modbus RTU device that requires an
RS-485 connection, terminate the 2-wire bus
cable from the Modbus device to one of the
removable 4-terminal blue plugs on the network
engine, labeled FC-A and FC-B (Figure 11).
Figure 11: FC Bus terminal block and wiring
connections for Modbus
2. For a Modbus RTU device that requires an
RS232C serial connection, use a cable to
connect the converter to either the RS232C A
or RS232C B serial port on the network engine.
The maximum cable length between devices
connected though an RS-232 line depends on
the baud rate used. In general, the cable should
not exceed 15 meters for 9600 baud.