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2 Design
High-function General-purpose Inverter RX2 Series User’s Manual
2-3 Wiring
2
2-3-7 Wiring for RS485-Communication Terminals
The 3G3RX2 Series has an RS485 communications capability that enables the inverter to communi-
cate with an external controller from its RS485 communications terminal block on the control terminal
block PCB.
For the communications protocol, the inverter supports the Modbus communication.
This section describes the wiring procedure for the RS485 communications terminal block and the
installation of the terminating resistor.
Wire size
2-3-7 Wiring for RS485-Communication Terminals
Wiring for RS485 Communications Terminal Block
Abbreviated
Terminal Name
Description Function
SP
RS485 Sending/receiving
terminal + side
At + side of Sending/receiving signal of RS485 communications
SN
RS485 Sending/receiving
terminal - side
At - side of Sending/receiving signal of RS485 communications
RP
Enable terminating resistor
terminal
A terminal which enables internal terminating resistor (100Ω).
The internal terminating resistor can be enabled when you con-
nect – side of RS485 communication sending/receiving terminal
(for connecting terminating resistor) to RP.
(SN)
RS485 Sending/receiving
terminal - side (for connect-
ing terminating resistors)
(CM1) Signal ground
You can connect a signal ground of an external communication
device. (Also for FM terminal)
Screw size
Tightening
torque [N·m]
Wire type
Wire size [mm
2
]
M2 0.22 to 0.25
Solid wire
0.14 to 1.5
(If two equal-sized wires are connected to one pole:
0.14 to 0.5)
Stranded wire
0.14 to 1.0
(If two equal-sized wires are connected to one pole:
0.14 to 0.2)
Stranded wire with
pin terminal
0.25 to 0.5
Digital output RS485 communication
EDM output
Control circuit terminal area
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