User manual

Chapter 2 Installation and Wiring
●Wiring of Serial Communication Interface
The inverter of this series provides standard RS485 serial communication interface for
users, which can be composed as master and slave network. By using a host PC or PLC,
The inverter in the network can be monitored in real time and controlled remotely and
automatically. Thus more complicated operation control can be realized.
Connection between the inverter and the host PC:
+5V
TXD
RXD
GND
DescriptionTerminal Name
RS485-
RS485+
signal negative
signal positive
DescriptionTerminal Name
RS485-
RS485+
signal negative
signal positive
Inverter
RS485 communication
interface
RS232/RS485 converter
DescriptionTerminal Name
Positive of 5V
Negative of 5V
Data Send
Data Receive
Pin NO. Symbol
Shell PE
2 RXD
3 TXD
5 GND
4 DTR
6 DSR
9 RI
1 CD
7 RTS
8 CTS
Shielded
wire
Host PC
RS232（DB9）
Fig 2-16 Connection between the inverter and the host PC
If several inverters (Max 31) are connected in the network by RS485, wiring is
especially important because the disturbance to the communication system increase,
STP (Shielded Twisted Pair) must be used for communication BUS, you can connect the
cables as follows:
485-
GND
485+
Inverter
485-
GND
485+
Inverter
485-
GND
485+
Inverter
485-
SG
485+
PLC
Shielded wire
Fig 2-17 Communication between PLC and the Inverter
(The Inverter and Motor are grounded well)
The master can be a host PC or a PLC, the slaves are inverters of this series. An
RS232/RS485 converter should be installed between the master and the bus when a PC
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