Mitsubishi Electric FR-A720-0.4K Instruction Manual page 322

Communication operation and setting
(3) RS-485 terminal system configuration
Connection of a computer to the inverter (1:1 connection)
Computer
RS-485
interface/
terminals
Combination of computer and multiple inverters (1:n connection)
Computer
RS-485
interface terminals
Computer
RS-232C
converter
Maximum
RS-232C
15m
cable
Converter
312
Inverter
RS-485
terminals
*
Twisted pair cable
Station 0 Station 1
Inverter
RS-485 RS-485
terminals terminals
*
Twisted pair cable
Station 0 Station 1
Inverter
RS-485
terminals
*
Twisted pair cable
Computer
RS-232C
cable
Converter
*Set the terminating resistor switch to the "100Ω" position.
Station n
Inverter Inverter
RS-485
terminals
* *
Station n
Inverter Inverter
RS-485 RS-485
terminals terminals
* *
Inverter
RS-485
terminals
Maximum
15m
*
Twisted pair cable
*Set only the terminating resistor switch of the
remotest inverter to the "100Ω" position.
*Set only the terminating resistor switch of the
remotest inverter to the "100Ω" position.