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3. WIRING
3-22
3.4.4 Wiring methods for communication operation
1) Wiring of one computer and one drive unit for RS-485
SDB
SDA
RDB
RDA
FG
SG
CSB
CSA
RSB
RSA
RDB
RDA
SDB
SDA
SG
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
PU connector
0.3mm or more
Drive unit
*1
2
2) Wiring of one computer and "n" drive units for RS-485
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
Computer
Cable connection and signal direction
10 BASE-T cable
Terminating
resistor
Station No. 1
Drive unit
Station No. 2
Drive unit
Station No. n
Drive unit
*1
NOTICE
Communication may be affected by reflection depending on the transmission speed
and/or transmission distance. Connect a Terminating resistor if reflection interferes
with communication. For connection using the PU connector, use a splitter since the
termination resistor cannot be fitted.
Connect the Terminating resistor to only the remotest drive unit from the computer.
(Terminating resistor: 100
Ω
)
Connect the terminals marked *1 in accordance with the instruction manual of the
computer used.
Fully check the terminal numbers of the computer as they differ between models.