Mitsubishi Electric FR-D700 Instruction Manual page 38

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 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 between 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 175.
Conforming standard: EIA-485 (RS-485)
Transmission form: Multidrop link
Communication speed: Maximum 38400 bps
Overall extension: 500m
Pin
Number
1)
2)
3)
4)
Inverter
(receptacle side) 5)
Viewed from bottom
6)
8) to 1)
7)
8)
Control circuit specifications
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
2
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