Wiring For Rs485-Communication Terminals - Omron RX2 Series User Manual

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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.
Wiring for RS485 Communications Terminal Block
Digital output
FM CM1
Abbreviated
Terminal Name
SP
SN
RP
(SN)
(CM1)
Wire size
Tightening
Screw size
torque [N·m]
M2 0.22 to 0.25
High-function General-purpose Inverter RX2 Series User's Manual
RS485 communication
SP SN SP SN
Description
RS485 Sending/receiving
terminal + side
RS485 Sending/receiving
terminal - side
Enable terminating resistor
terminal
RS485 Sending/receiving
terminal - side (for connect-
ing terminating resistors)
Signal ground
Wire type
Solid wire
Stranded wire
Stranded wire with
pin terminal
EDM output
RP ED- ED+
Control circuit terminal area
Function
At + side of Sending/receiving signal of RS485 communications
At - side of Sending/receiving signal of RS485 communications
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.
You can connect a signal ground of an external communication
device. (Also for FM terminal)
Wire size [mm
0.14 to 1.5
(If two equal-sized wires are connected to one pole:
0.14 to 0.5)
0.14 to 1.0
(If two equal-sized wires are connected to one pole:
0.14 to 0.2)
0.25 to 0.5
2 Design
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