Omron RX2 Series User Manual page 595

RS485 Port Specifications and Connections
The RS485 communications function uses RS485 communication terminal block for terminals of the
control circuit.
Wire the RS485 communications terminal block as follows.
Digital output
FM CM1
Abbreviated
Terminal Name
SP
SN
RP
(SN)
(CM1)
The wire size and tightening torque recommended for RS485 communication terminal block are as fol-
lows.
Screw Tightening
size torque [N·m]
M2 0.22 to 0.25
Connections
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 3G3RX2 Series Inverter, shorting the RP and RS terminals enables the built-in terminating
resistor (100 ).
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
ferrule
9 Communications Functions
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 (Example: PC-1.25F7 1.25=3AF from JST Mfg.
Co., Ltd.)
2
]
9 - 3
9