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27
2
INSTALLATION AND WIRING
<Wiring method>
1) Wiring of one RS-485 computer and one inverter
2) Wiring of one RS-485 computer and "n" inverters (several inverters)
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
transmission distance. If this reflection hinders communication, provide a terminal resistor. If the
PU connector is used to make a connection, use a distributor as a terminal resistor cannot be
fitted. Connect the terminal resistor only to the inverter remotest from the computer. (Terminal
resistor: 100)
Computer Side Terminals
Signal name Description
RDA
RDB
SDA
SDB
RSA
RSB
CSA
CSB
SG
FG
Receive data
Receive data
Send data
Send data
Request to send
Request to send
Clear to send
Clear to send
Signal ground
Frame ground
PU connector
SDA
SDB
RDA
RDB
SG
(Note 1)
0.3mm or more
2
Cable connection and signal direction
10BASE-T Cable
Inverter
(Note 1)
Computer
RDA
RDB
SDA
SDB
RSA
RSB
CSA
CSB
SG
FG
Station 1
SG
RDB
RDA
SDB
SDA
Station 2
SG
RDB
RDA
SDB
SDA
Station n
SG
RDB
RDA
SDB
SDA
Inverter
Inverter Inverter
Cable connection and signal direction
10BASE-T Cable
Termination
resistor
(Note 2)