7 Serial interface (Modbus RTU)
7.1 General
142 DC1 Frequency Inverter 10/12 MN04020003Z-EN www.eaton.com
7.1.2 Serial interface A-B
The electrical connection between the master and the slaves is established
with RJ-45 cables. If multiple slaves are being used, they are connected in
parallel by using RJ-45 cables and DX-SPL-RJ45-3SL splitters.
The DC1 frequency inverter built-in RJ45 port supports the Modbus RTU pro-
tocol and therefore allows a direct network connection without an additional
interface module. The network cable must be provided at each physical end
(last station) with a bus termination resistor of 120 in order to prevent sig-
nal reflections and the resulting transfer errors.
Splitter model DX-CBL-TERM includes the required resistor mentioned
above.
Figure 83: RJ-45 socket wiring
Pin Meaning
1 CANopen -
2 CANopen +
3 0V
4 RJ45 connection / external operating unit / PC connection -
5 RJ45 connection / external operating unit / PC connection +
6 24 V DC power supply
7 RS485- Modbus RTU
8 RS485+ Modbus RTU
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