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8 Communications Functions
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
8-1 Communication Specifications
8
The RS485 communications function uses the communications terminal block TM2 located on the left
side of the control terminal block.
Wire the RS485 communications terminal block as follows.
The wire size and tightening torque recommended for the communications terminal block TM2 are as
follows.
Connect the inverters parallel to each other as shown below. For termination, enable the terminating
resistor only for the terminal Inverter.
Use the terminating resistor even if you have only one Inverter connected.
Selecting a terminating resistor that matches the cable impedance improves the terminating effect.
For the 3G3RX-V1 Series Inverter, shorting the RP and RS terminals enables the built-in terminating
resistor (100 Ω).
RS485 Port Specifications and Connections
Terminal
symbol
Terminal name Description
RS+
RS485
communications port
RS485 communications send/receive
terminal, positive side
RS–
RS485 communications send/receive
terminal, negative side
RP
Terminating Resistor
enable terminal
Use these terminals to enable the
built-in terminating resistor for the
RS485 communications port.
The terminating resistor is enabled
when shorted. (Built-in terminating
resistor value: 100 Ω)
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 F7 from JST Mfg. Co., Ltd.)
Connections
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