Mitsubishi Electric FR-E500 Instruction Manual page 43

<Wiring methods>
1) Wiring of one RS-485 computer and one inverter
Computer Side Terminals
Signal name
RDA
RDB
SDA
SDB
RSA
RSB
CSA
CSB
SG
FG
2) Wiring of one RS-485 computer and "n" inverters (several inverters)
Computer
RDA
RDB
SDA
SDB
RSA
RSB
CSA
CSB
SG
FG
Note: 1. There may be the influence of reflection depending on the transmission
speed
communication, provide a termination resistor. If the PU connector is used
to make a connection, use the distributor as a termination resistor cannot be
fitted.
Connect the termination resistor to only the inverter remotest from the
computer. (Termination resistor: 100Ω)
2. Make connections in accordance with the instruction manual of the
computer used.
Fully check the terminal numbers of the computer as they differ between
models.
Cable connection and signal direction
Description
Receive data
Receive data
Send data
Send data
Request to send
Request to send
Clear to send
Clear to send
Signal ground
Frame ground
Cable connection and signal direction
10 BASE-T Cable
(Note 2)
SG
Station 1
Inverter
and/or transmission
INSTALLATION AND WIRING
10 BASE-T Cable
(Note 2)
2
0.3mm or more
Termination
resistor
jumper
SG
(Note 1)
Station 2
Inverter
distance. If this
30
Inverter
PU connector
SDA
SDB
RDA
RDB
SG
Termination
resistor
(Note 1)
SG
Station 3
Inverter
reflection hinders