5
3 Connection
3-1 Connection method
Use shielded wires (Recommended cable: Refer to 2. Transmission specification) and connect the wires
between the control terminals (DX+, DX- and SD) of the inverter and the host unit so as to surely become
drawing in one stroke.
Warning
Be sure to wire after power supply off.
There is a fear of electric shock.
Caution
This cannot connect with RS422A interface. (Because this can do only one way
communication, the response cannot be received.)
There is a fear of damage.
Note:
1) Shorten the wiring as possible to be hard against noise influence.
2) Connection with RS232C units uses a communication level converter on the market.
(Refer to "11-1 Communication level converter").
3) Assign the different station address to the inverters.
Control terminals (only for communication)
Terminal
marking
Terminal name Function description
DX+
RS485 communication data (+)
DX-
RS485 communication data (–)
Input/output terminals for RS485 communication. Max. 31
inverters can be connected by multi-drop connection.
SD
For connection to
communication cable sheath
Connecting shielded wire of cable. Electrically floating
Control terminal arrangement
･･････････
In detail, refer to "Connection" of the instruction manual of inverter.
DX- DX+ SD
3-2 RS485
RS485 interface is used when performing multi-drop bidirectional communication. The input/output terminals are
provided for 2-wire and 4-wire connections. Either unit of the connections can be used (using as 2-wire
connection).
Type Description Example of terminals
2-wire
connection
Input and output (driver and receiver) are
internally connected.
TRD+
･････
Differential input terminal (hot side)
TRD-
･･････
Differential output terminal (common side)
FG
････････
Frame ground
4-wire
connection
Input and output (driver and receiver) are
separated.
IN+, IN-
･･････････
Differential input terminal
OUT+, OUT-
･････
Differential output terminal
SD
･･･････････････
Signal ground
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