Mitsubishi Electric FR-A820-00046 Instruction Manual page 785

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Parameters
● Multiple inverters and 1 computer with RS-485 terminals
Computer
Fig. 5-306:
Make connection in accordance with the Instruction Manual of the computer to be used with.
Fully check the terminal numbers of the computer since they vary with the model.
For the inverter farthest from the computer, set the terminating resistor switch to ON (100 Ω side).
NOTE
For branching, connect the wires as shown below.
To computer ground
To computer receive
To computer send
Two-wire type connection
If the computer is 2-wire type, a connection from the inverter can be changed to 2-wire type by pass-
ing wires across reception terminals and transmission terminals of the RS-485 terminals.
Fig. 5-307:
NOTE
A program should be created so that transmission is disabled (receiving state) when the computer
is not sending and reception is disabled (sending state) during sending to prevent the computer
from receiving its own data.
FR-A800
RDA
RDB
SDA
SDB
RSA
RSB
∗1
CSA
CSB
SG
SG
FG
Connection to several inverter
VCC
TXD RXD
Transmission
enable
Reception
enable
2-wire type connection
(N) Operation via communication and its settings
SG
SG
Station 1
Station 0
VCC
TXD RXD
Computer
Pass a wire
SG
SG
SG
Station n
To receiving terminal
of the next inverter
To sending terminal
of the next inverter
To next inverter
To earth (ground)
terminal
Inverter
TXD+
TXD-
RXD+
RXD-
SG
∗2
I002731E
I002733E
5 - 605

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