Mitsubishi Electric FR-A806 Instruction Manual page 54

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 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 SDB1
(VCC) (GND) (TXD1+) (TXD1-)
OPEN
VCC GND + TXD
100Ω
VCC GND + TXD
P5S SG SDA2 SDB2
(VCC) (GND) (TXD2+) (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.
EIA-485 (RS-485)
Multidrop link
maximum 115200 bps
500 m
Twisted pair cable (4 pairs)
RDA1 RDB1
(RXD1+) (RXD1-)
- + RXD -
- + RXD -
RDA2 RDB2
(RXD2+) (RXD2-)
Communication connectors and terminals
INSTALLATION AND WIRING
2
53