Connecting LonWorks devices
About this task:
To connect LonWorks devices, complete the following
steps:
1. Connect the 2-wire cable from the LonWorks trunk
to the removable 3-terminal blue plug labeled LON
(Figure 3). The LonWorks network trunk is available
on the MS-NAE5520-3 model only.
Figure 9: LonWorks network terminal block and wiring
connections
Table 4: LON trunk terminal block wiring
Callout Description
1 LonWorks network terminal block
2 LonWorks network terminal block plug
3
Terminating wires (2-wire cable shown)
Note: LonWorks network wires are not polarity
sensitive.
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.
Connecting Modbus RTU devices
About this task: The network engine 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 10).
Figure 10: FC Bus terminal block and wiring connections
for Modbus
Table 5: FC Bus terminal block wiring for Modbus
Callout Description
1 FC Bus terminal block
2 FC Bus terminal block plug
3 Terminating wires for Modbus (2-wire cable shown)
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.
3. Wire from the RS-485 terminal on the converter to
the RS-485 port on the vendor device (Figure 11).
The RS-485 bus is a two-wire network.
a. Connect the converter's + A terminal to the
device's + (or A) terminal.
b. Connect the converter's - B terminal to the
device's - (or B) terminal.
Figure 11: Connection between converter and device
4. To add additional vendor devices, wire from one
device to the next in a daisy chain configuration.
The completed wiring should look similar to Figure
12.
NAE55 Installation Guide 9
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