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INSTALLATION AND WIRING
28
<Wiring methods>
1) Wiring of one RS-485 computer and one inverter
SDB
SDA
RDB
RDA
FG
SG
CSB
CSA
RSB
RSA
RDB
RDA
SDB
SDA
SG
(Note 1)
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
Inverter
PU connector
0.3mm or more
2
2) Wiring of one RS-485 computer and "n" inverters (several inverters)
SDB
SDA
RDB
RDA
FG
SG
CSB
CSA
RSB
RSA
(Note 1)
SG
RDB
RDA
SDB
SDA
SG
RDB
RDA
SDB
SDA
SG
RDB
RDA
SDB
SDA
Computer
Station 1
Station 2
Station n
Inverter Inverter Inverter
Termination
resistor
(Note 2)
Cable connection and signal direction
10 BASE-T Cable
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 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: 100
Ω
)
2