Mitsubishi Electric FR-D720S SC EC, Instruction Manual, Page: 346 / 512

Communication operation and settings Parameter
6 - 196
Connection with RS485 computer
●
Wiring of one RS485 computer and one inverter
●
Wiring of one RS485 computer and "n" inverters (several inverters)
Make connection in accordance with the instruction manual of the computer to be used with.
Fully check the terminal numbers of the computer since they vary with the model.
The inverters may be affected by reflection depending on the transmission speed or
transmission distance. If this reflection hinders communication, provide a terminating
resistor. If the PU connector is used to make a connection, use a distributor since a
terminating resistor cannot be fitted. Connect the terminating resistor to only the inverter
remotest from the computer. (Terminating resistor: 100
Ω
)
I001938E
Fig. 6-101: Connection to an inverter
I001939E
Fig. 6-102: Connection to several inverter
NOTE Do not use pins No. 2, 8 of the FR-A5CBL cable. (Refer to page 6-193.)
Computer side terminals
PU connector
Cable connection and signal direction
Receive data
Receive data
Send data
Send data
Signal ground
0,2 mm² or more
Inverter
PC
Station 0 Station 1 Station n
Terminating
resistor
Receive
Send