Connection Diagram For Modbus Rs-232C; Connection Diagram Between Fx Plc And Modbus Rs-232C Equipment - Mitsubishi FX3U Series User Manual

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
4.4

Connection Diagram for MODBUS RS-232C

Representative wiring examples are shown in this section. When pin numbers in the counterpart equipment
are different, wire the pins as shown below.
4.4.1

Connection diagram between FX PLC and MODBUS RS-232C equipment

Name
FG
RD(RXD)
SD(TXD)
ER(DTR)
SG(GND)
DR(DSR)
*1. For third-party external equipment requiring the Control Signal, connect these pins.
The FX
3U
24
PLC side
FX -232ADP-MB
3U
9-pin D-Sub
−
2
3
4
5
*1
6
-232ADP-MB does not require these pins to be connected.
4.4 Connection Diagram for MODBUS RS-232C
External equipment operating in accordance
with MODBUS RS-232C
When CS and
RS are used
Name
9-pin 25-pin
D-Sub D-Sub
−
FG 1 FG
RD(RXD) 2 3 RD(RXD)
SD(TXD) 3 2 SD(TXD)
RS(RTS) 7 4 ER(DTR)
SG(GND) 5 7 SG(GND)
CS(CTS) 8 5 DR(DSR)
When DR and
ER are used
Name
9-pin 25-pin
D-Sub D-Sub
−
1
2 3
3 2
4 20
5 7
6 6
4 Wiring