Chapter 2 Installation and Wiring
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Wiring of Serial Communication Interface
The ac drive 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 ac drive 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 ac drive and the host PC:
+5V
TXD
RXD
GND
Description
Terminal Name
RS485-
RS485+
signal negative
signal positive
Description
Terminal Name
RS485-
RS485+
signal negative
signal positive
Inverter
RS485 communication
interface
RS232/RS485 converter
Description
Terminal 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 ac drive and the host PC
If several ac drives (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 Ac drive
(The Ac drive and Motor are grounded well)
The master can be a host PC or a PLC, the slaves are ac drives of this series. An
