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3. WIRING
3-15
3
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
PU connector
Drive unit
*1
0.3mm or more
2
10 BASE-T cable
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
Terminating
resistor
Station No. 1
Drive unit
Station No. 2
Drive unit
Station No. n
Drive unit
*1
10 BASE-T cable
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.