Mitsubishi Electric FR-A700 Instruction Manual page 624

Communication operation and setting
2-wire type connection
If the computer is 2-wire type, pass wires across reception terminals and transmission terminals
of the RS-485 terminal to enable 2-wire type connection with the inverter.
Transmission
enable
Reception
enable
NOTE Create a program so that transmission is disabled (receiving state) when the computer is not
sending and reception is disabled (sending state) during sending to prevent the computer
from receiving its own data.
6 - 444
Inverter
Computer
Pass a wire
Fig. 6-220:
2-wire type connection
Parameter
I001219E