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Communication connectors and terminals
WARNING
 While power is ON or when the inverter is running, do not open the front cover. Otherwise you may
get an electric shock.
2.8.3

RS-485 terminal block

Communication operation
Conforming standard
Transmission format
Communication speed
Overall length
Connection cable
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 program 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 the FR-A800 Instruction Manual (Detailed).
Terminating resistor switch
Initially-set to "OPEN".
Set only the terminating resistor switch of
the remotest inverter to the "100Ω" position.
P5S
SG
SDA1
(VCC)
(GND)
(TXD1+)
OPEN
VCC
GND
+ TXD
100Ω
VCC
GND
+ TXD
P5S
SG
SDA2
(VCC)
(GND)
(TXD2+)
NOTE
• To avoid malfunction, keep the RS-485 terminal wires away from the control circuit board.
• When is used with a plug-in option, lead the wires on the left side of the plug-in option for wiring of the RS-485 terminals.
50
INSTALLATION AND WIRING
EIA-485 (RS-485)
Multidrop link
maximum 115200 bps
500 m
Twisted pair cable (4 pairs)
SDB1
RDA1
RDB1
(TXD1-)
(RXD1+)
(RXD1-)
-
+
RXD
-
-
+
RXD
-
SDB2
RDA2
RDB2
(TXD2-)
(RXD2+)
(RXD2-)

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