Mitsubishi Electric FR-D720 K Series Instruction Manual page 41

Control circuit specifications
RS-485 communication
When the PU connector is connected with a personal, FA or other computer by a communication cable, a user program can
run and monitor the inverter or read and write to parameters.
The protocol can be selected from Mitsubishi Electric inverter and MODBUS RTU.
PU connector pin-outs

NOTE
 Pins No. 2 and 8 provide power to the parameter unit. Do not use these pins for RS-485 communication.
 When making RS-485 communication with a combination of the FR-D700 series, FR-E500 series and FR-S500 series,
incorrect connection of pins No. 2 and 8 (parameter unit power supply) of the above PU connector may result in the
inverter malfunction or failure.
 Do not connect the PU connector to the computer's LAN board, FAX modem socket or telephone modular connector.
The product could be damaged due to differences in electrical specifications.
For further details, refer to page 181.
Conforming standard: EIA-485 (RS-485)
Transmission form: Multidrop link
Communication speed: Maximum 38400 bps
Overall extension: 500m
30
Pin
Number
1)
2)
3)
4)
Inverter
(receptacle side)
5)
Viewed from bottom
6)
8) to 1)
7)
8)
Name Description
Earth (ground)
SG
(connected to terminal 5)
— Parameter unit power supply
RDA Inverter receive+
SDB Inverter send-
SDA Inverter send+
RDB Inverter receive-
Earth (ground)
SG
(connected to terminal 5)
— Parameter unit power supply