Mitsubishi Electric FR-A800, Instruction Manual

Page: 90 / 1042

Communication connectors and terminals Installation and wiring
2 - 60
2.7.3 RS-485 terminal block
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 5-602.
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. 2-28: Specifications of the RS-485 terminal block
I002384E
Fig. 2-43: 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