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2 Design
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
2-3 Wiring
2
2-3-7 Wiring for RS485 Communications Terminals
The 3G3RX-V1 Series has an RS485 communications capability that enables the inverter to
communicate 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 and the ASCII
format.
This section describes the wiring procedure for the RS485 communications terminal block and the
installation of the terminating resistor.
Wire size and tightening torque
2-3-7 Wiring for RS485 Communications Terminals
Wiring for RS485 Communications Terminal Block
Terminal
symbol
Terminal name Function
RS+
RS485
communications
send/receive
terminal, positive
side
Positive-side send/receive terminal
signal for RS485 communications.
RS–
RS485
communications
send/receive
terminal, negative
side
Negative-side send/receive terminal
signal for RS485 communications.
RP
Terminating Resistor
enable terminal
The RP terminal is used to enable the
built-in Terminating Resistor (100 Ω).
Connect the negative-side RS485
communications send/receive
terminal (for Termination Resistor
connection) with the terminal RP to
enable the built-in Terminating
Resistor.
RS–
RS485
communications
send/receive
terminal, negative
side (for Terminating
Resistor connection)
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
(Example: PC-1.25 F-7 from JST Mfg. Co., Ltd.)
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