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Mitsubishi Electric FX5 User Manual page 58

Melsec iq-f series
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■Connection diagram between FX-485PC-IF and the personal computer
FX-485PC-IF
Name
Pin No.
SD (TXD)
RD (RXD)
RS (RTS)
CS (CTS)
DR (DSR)
SG (GND)
ER (DTR)
RS-485/RS-422
■One-pair wiring
RS-485 Communication
equipment
SDA
(TXD+)
SDB
Terminal
(TXD-)
resistor
110 
RDA
*2
(RXD+)
RDB
(RXD-)
LINK
SG
*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 built-
in termination resistors. Set the termination resistor selector switch to 110 .
■Two-pair wiring
RS-485/RS-422
Communication equipment
SDA
(TXD+)
SDB
*2
(TXD-)
RDA
(RXD+)
RDB
*2
(RXD-)
Terminal
LINK
resistor
SG
 × 2
330
*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 terminal resistor at the end of each line. Set built-in RS-485 port, FX5-485-BD, and FX5-485ADP to 330 
depending on the the terminal resistor selector switch.
3 MC PROTOCOL
56
3.5 Wiring
2
3
4
5
6
7
20
Built-in RS-485 port
FX5-485-BD
FX5-485ADP
SDA
(TXD+)
SDB
(TXD-)
RDA
(RXD+)
RDB
(RXD-)
SG
Class-D grounding
*1
Built-in RS-485 port
FX5-485-BD
FX5-485ADP
SDA
(TXD+)
SDB
(TXD-)
RDA
(RXD+)
RDB
(RXD-)
SG
Class-D grounding
*1
Personal computer
Name
SD (TXD)
RD (RXD)
RS (RTS)
CS (CTS)
DR (DSR)
SG (GND)
ER (DTR)
Built-in RS-485 port
FX5-485-BD
FX5-485ADP
SDA
(TXD+)
SDB
(TXD-)
RDA
(RXD+)
RDB
(RXD-)
SG
Class-D grounding
*1
Built-in RS-485 port
FX5-485-BD
FX5-485ADP
SDA
(TXD+)
SDB
(TXD-)
RDA
(RXD+)
RDB
(RXD-)
SG
Class-D grounding
*1
Built-in RS-485 port
FX5-485-BD
FX5-485ADP
SDA
(TXD+)
SDB
(TXD-)
RDA
(RXD+)
RDB
(RXD-)
SG
Class-D grounding
*1
Built-in RS-485 port
FX5-485-BD
FX5-485ADP
SDA
(TXD+)
SDB
(TXD-)
RDA
(RXD+)
RDB
(RXD-)
Terminal
SG
330
Class-D grounding
*1
Terminal
resistor
110 
*2
*2
*2
resistor
 × 2

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