Mitsubishi Electric FR-F500 Series Instruction Manual page 35

<Wiring method>
1) Wiring of one RS-485 computer and one inverter
Computer Side Terminals
Signal
Description
name
RDA Receive data
RDB Receive data
SDA Send data
SDB Send data
RSA Request to send
RSB Request to send
CSA Able to send
CSB Able to send
SG Signal ground
FG Frame ground
2) Wiring of one RS-485 computer and "n" inverters (several inverters)
Computer
RDA
RDB
SDA
SDB
RSA
Note
RSB
1
CSA
CSB
SG
FG
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 Ω)
Cable connection and signal direction
10BASE-T Cable
Note 1
Cable connection and signal direction
10 BASE-T Cable
SG SG
Station 1 Station 2
Inverter Inverter
INSTALLATION AND WIRING
Inverter
PU
connector
SDA
SDB
RDA
RDB
2
0.3mm or more
SG
SG
Station n
Inverter
24
Termination
resistor
(Note 2)
2