Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

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Communication connectors and terminals Installation and wiring
2 - 70
2.7.3 RS-485 terminal block (not for FR-A800-E)
Communication operation
The RS-485 terminals enable communication operation from a personal computer, etc. When the PU
connector is connected with a personal, FA or other computer by a communication cable, a user pro-
gram can run to monitor the inverter or read and write parameters.
Communication can be performed with the Mitsubishi inverter protocol (computer link operation)
and Modbus® RTU protocol.
For the details, refer to page 5-622.
Item Specification
Conforming standard EIA-485 (RS-485)
Transmission format Multidrop link
Communication speed Maximum 115200 bps
Overall length 500 m
Connection cable Twisted pair cable (4 pairs)
Tab. 2-29: Specifications of the RS-485 terminal block
I002384E
Fig. 2-47: RS-485 terminal block
NOTE Upon delivery the FR-A800-E inverter models are not equipped with the RS-485 terminal block.
+ - + TXD RXD - VCC GND
+ - + TXD RXD - VCC GND
RDA1
(RXD1+)
RDB1
(RXD1-)
RDA2
(RXD2+)
RDB2
(RXD2-)
SDA1
(TXD1+)
SDB1
(TXD1-)
SDA2
(TXD2+)
SDB2
(TXD2-)
P5S
(VCC)
SG
(GND)
P5S
(VCC)
SG
(GND)
Terminating resistor switch
Initially set to "OPEN".
Set only the terminating resistor switch of
the remotest inverter to the "100
Ω
" position.
100
Ω
OPEN