Johnson Controls NIE39 Installation Instructions Manual page 9

Note: If the number of M-Bus unit loads or distances exceeds the specifications of a level converter, an M-Bus
repeater can be wired to the converter to increase the number of unit loads and distances. The converter
shown in Figure 10
See NIE Ordering Information
4. Connect the 24 VAC supply power wires from the transformer to the removable power terminal block plug on
the NIE (Figure 9).
Note: Power supply wire colors may be different on transformers not manufactured by Johnson Controls. Follow
the transformer manufacturer's instructions and the project installation drawings.
5. Connect the 24 VAC supply power wires from the transformer to the -/~ and +/~ terminals as shown in
10.
Wiring the NIE for KNX Protocol
1. Connect an Ethernet cable to the RJ-45, 8-pin Ethernet port shown in
2. Connect another Ethernet cable to the port on the front of the KNX gateway
Note: Depending on the size of your network, you can use either a KNX Interface or Router as a gateway. The
Interface connects the NIE to a single KNX line, while the Router acts as both an Interface and a Line
Coupler over Ethernet to connect the NIE to the network, not to a single device.
NIE39/NIE49 Installation Instructions
is capable of handling up to 6 units loads, while other models can handle up to 100.
for a list of M-Bus devices.
Figure 10: M-Bus Level Converter
Figure 1.
(Figure 11).
Figure
9