Mitsubishi Electric FR-D720-0.2K-G Instruction Manual page 37

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 drive unit or read and write to parameters.
The protocol can be selected from Mitsubishi Electric drive unit 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-G series, FR-F500J 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 drive unit 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
26
Pin
Number
1)
2)
3)
4)
Drive unit
(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 Drive unit receive+
SDB Drive unit send-
SDA Drive unit send+
RDB Drive unit receive-
Earth (ground)
SG
(connected to terminal 5)
— Parameter unit power supply