29
3-7-3
．
Cable connection
CPU RS232 port:
OP LG Master-K80/120 RS232
9-pin D-type female port 9-pin D-type male port
（
Diagram 1— fit for OP all series
）
3-8
．
LG Master-K (Modbus) series PLC (multi-function port)
3-8-1
．
Connection unit
Connect through Modbus Rtu protocol
Series Connected
module
Port
Cable
Choose PLC type in OP20
K80
K120
Modbus Rtu
protocol
RS232
Diagram 1
LG Master-K80/120S multi-function port
(Modbus)
Note:
For LG Master K-Modbus Rtu, please turn ON switch 2 and turn OFF switch 1. (it is no
need to change the switch for LG Master KxxxS programming port).
3-8-2
．
Communication parameters
LG Master-K80/120
（
Modbus Rtu
）
series PLC OP software settings:
Parameters Recommend settings
Choices of settings
Notes
PLC type
LG Master-K80/120
Multi-function
port
（
Modbus Rtu
）
Choose the correct PLC type in
OP20
Port
RS232
RS232
Data bit
8
7/8
Accord with PLC port parameters
Stop bit
1
1/2
Accord with PLC port parameters
Parity
Even parity
Even /odd /no parity
Accord with PLC port parameters
Baud rate
9600
4800/38400/9600/
115200/19200/187500
Accord with PLC port parameters
