Figure 12: Modbus RTU wiring detail overview
Connecting M-Bus devices
About this task: The network engine connects to
the M-Bus network devices by using the M-Bus Level
Converter. Two components are needed: serial connection
cable (INT-DX-KAB01) and the M-Bus Level Converter.
(After installation and wiring are complete, refer to the
Network Engine Commissioning for M-Bus Vendor Integration
Application Note (LIT-12013149) for additional information.)
1. Connect the RS-232 cable from either RS232C
serial port on the network engine to the RS-232
connection on the M-Bus Level Converter using
cable INT-DX-KAB01 (Figure 13). Wire to terminals
GND, RxD, and TxD (Table 6).
2. Wire from the M- and M+ terminals on the level
converter to the meters using a free (star, ring,
or bus) topology, preferably bus. Specific cabling
can vary depending on the topology and site. See
Wiring considerations and guidelines for network
integrations.
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 13 is capable of handling up to 100 unit
loads. See Ordering information for a list of M-
Bus devices.
3. Connect the 24 VAC supply power wires from the
transformer to the -/~ and +/~ terminals as shown
in Figure 13.
Figure 13: M-Bus Level Converter Connections
Table 6: M-Bus Level Converter connection detail
Callout Description
1
M-Bus connections:
13: M+
14: M-
2
Power connections (24 VAC/DC):
9: PE
11: 24+ V/~
12: 24- V/~
3
RS-232 wire connection (serial cable INT-DX-KAB01):
5: TxD (transmit data); PIN 2 on RJ12
6: RxD (receive data); PIN 3 on RJ12
7: GND (ground); PIN 5 on RJ12
4 To network engine RS-232C port
Connecting KNX devices
About this task: The network engine connects to a KNX
network device by using the KNX/IP interface router.
(After installation and wiring are complete, refer to the
Network Engine Commissioning for KNX Vendor Integration
Application Note (LIT-12013148) for additional information.)
1. Connect an Ethernet cable from the building's
network jack to the port on the front of the KNX
gateway (Figure 14).
NAE55 Installation Guide10
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