Wiring Methods For Communication Operation - Mitsubishi Electric MELIPM Series Instruction Manual

3.4.4 Wiring methods for communication operation

1) Wiring of one computer and one drive unit for RS-485
Computer Side Terminals
Signal name
RDA
RDB
SDA
SDB
RSA
RSB
CSA
CSB
SG
FG
2) Wiring of one computer and "n" drive units for RS-485
Computer
RDA
RDB
SDA
SDB
RSA
RSB
CSA
CSB
SG
FG
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
NOTICE
from the computer. (Terminating resistor: 100Ω)
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.
Cable connection and signal direction
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
*1
SG
Station No. 1
Drive unit
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10 BASE-T cable
*1
2
0.3mm or more
SG
Station No. 2
Drive unit
3-15
3. WIRING
Drive unit
PU connector
SDA
SDB
RDA
RDB
SG
Terminating
resistor
SG
Station No. n
Drive unit
3