Mitsubishi Electric FR-E 500 Instruction Manual page 41

<Wiring methods>
1) Wiring of one RS-485 computer and one inverter
Computer Side Terminals
Signal name
RDA
RDB
SDA
SDB
RSA Request to send
RSB Request to send
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. 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.
2. There may be the influence of reflection depending on the transmission
speed and/or
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)
Cable connection and signal direction
Description
Receive data
Receive data
Send data
Send data
Clear to send
Clear to send
Signal ground
Frame ground
Cable connection and signal direction
10 BASE-T Cable
(Note 1)
SG
Station 1
Inverter
transmission
INSTALLATION AND WIRING
10 BASE-T Cable
(Note 1)
2
0.3mm or more
SG
Station 2
Inverter
distance. If this
28
Inverter
PU connector
SDA
SDB
RDA
RDB
SG
Termination
resistor
(Note 2)
SG
Station n
Inverter
reflection hinders
2