Termination Resistor Setting; Connection Diagram - Mitsubishi Electric FX5 User Manual

Termination resistor setting

Make sure to provide a termination resistor at both ends of the wire.
The built-in RS-485 port, FX5-485-BD and FX5-485ADP have a built-in termination resistor.
Set the termination resistor selector switch to 110 .
FX5U CPU module built-in RS-485 port
FX5-485-BD

Connection diagram

Use one-pair wiring for an N:N Network.
Built-in RS-485 port
FX5-485-BD
FX5-485ADP
SDA
(TXD+)
SDB
Terminal
(TXD-)
resistor
110 
RDA
*2
(RXD+)
RDB
(RXD-)
SG
Class-D grounding
*1 Make sure to perform Class-D grounding on the shield of the twisted pair cable to be connected.
*2 Make sure to provide a termination resistor at both ends of the wire. The built-in RS-485 port, FX5-485-BD and FX5-485ADP have buil-
tin termination resistors. Set the termination resistor selector switch to 110 .
Termination
resistor selector
switch
Termination
resistor
selector switch
Built-in RS-485 port
FX5-485-BD
FX5-485ADP
SDA
(TXD+)
SDB
(TXD-)
RDA
(RXD+)
RDB
(RXD-)
SG
*1
Class-D grounding
FX5UC CPU module built-in RS-485 port
FX5-485ADP
Built-in RS-485 port
FX5-485-BD
FX5-485ADP
SDA
(TXD+)
SDB
Terminal
(TXD-)
resistor
110 
RDA
*2
(RXD+)
RDB
(RXD-)
SG
*1
Termination
resistor selector
switch
Termination
resistor selector
switch
2 N:N NETWORK
21
2.5 Wiring
2