Omron MX2 Series - Wiring for RS-485 Communications Terminals

2 Design
2 - 43
Multi-function Compact Inverter 3G3MX2-EV2 User’s Manual (I666-E1)
RS485 terminal
2-3-6 Wiring for RS-485 Communications Terminals
This inverter has RS-485 communications terminals on its control circuit terminal block.
It uses the Modbus communication protocol to establish communications with external controllers.
This section describes the wiring procedure for the RS-485 communications terminal block and the
installation of the terminating resistor.
On the control circuit terminal block, the following RS-485 communications terminals are provided.
Terminal
symbol
Terminal name
Function
SN
RS-485 communications send/receive
terminal, negative side
Negative-side send/receive terminal for RS-485 com-
munications.
SP
RS-485 communications send/receive
terminal, positive side
Positive-side send/receive terminal for RS-485 commu-
nications.
USB port is for computer
use only. RS422 (RJ45
modular connector) port
is for Digital Operator
use only.
Terminating resistor
selector switch
EA
7
6
5
4
3
2
1
L
PLC
P24
P24S
SP
SN
H
O
OI
L
EO
AM
CM2
12
11
2
2-3 Wiring
2-3-6 Wiring for RS-485 Communications Terminals
Wiring for RS485 Communications Terminal Block