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<Wiring method>
1) Wiring of one RS-485 computer and one inverter
2) Wiring of one RS-485 computer and "n" (multiple) inverters
CAUTION
1. Make connections in accordance with the manual of the computer used.
Fully check the terminal numbers of the computer since they vary with the model.
2. There may be the influence of reflection depending on the transmission speed and/or transmission
distance. If this reflection hinders communication, provide a terminating resistor. If the PU connector
is used to make a connection, use a distributor since a terminating resistor cannot be fitted.
Connect the terminating resistor to only the inverter remotest from the computer.
(terminating resistor: 100Ω)
SDB
SDA
RDB
RDA
FG
SG
CSB
CSA
RSB
RSA
RDB
RDA
SDB
SDA
SG
PU connector
Computer Side Terminals
Signal name
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
(Caution 1)
0.2mm or more
2
Inverter
SDB
SDA
RDB
RDA
FG
SG
CSB
CSA
RSB
RSA
SG
RDB
RDA
SDB
SDA
SG
RDB
RDA
SDB
SDA
SG
RDB
RDA
SDB
SDA
Inverter
Computer
Cable connection and signal direction
10 BASE-T cable
(Caution 1)
Terminating
resistor
(Caution 2)
Station 1
Inverter
Station 2
Inverter
Station n