Communication Setting For Modbus - Mitsubishi FX3U Series User Manual

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
6.2

Communication setting for MODBUS

The following devices are used in the communication setting.
When using the communication port (Ch1), set D8400.
When using the communication port (Ch2), set D8420.
1) D8400 and D8420 (communication format)
By setting values to D8400 or D8420, the data length, parity, baud rate, etc. can be set.
The table below shows the contents of D8400 and D8420.
Bit No.
b0
b1
b2
b3
b4
b5
b6
b7
b8 -11
b12
b13-15
Name
Data length
Parity
b2, b1
Parity (0, 0): Not provided
(0, 1): Odd
(1, 1): Even
Stop bit
b7, b6, b5, b4
(0, 0, 1, 1): 300
Baud rate (bps) (0, 1, 0, 0): 600
(0, 1, 0, 1): 1200
(0, 1, 1, 0): 2400
Reserved
H/W type
Reserved
6 Related Devices and Communication Status
6.2 Communication setting for MODBUS
Contents
0 (bit = OFF)
7-bit
1-bit
b7, b6, b5, b4
(0, 1, 1, 1): 4800
(1, 0, 0, 0): 9600
(1, 0, 0, 1): 19200
RS232C
1 (bit = ON)
8-bit
2-bit
RS485
37
1
2
3
4
5
6
7
8
9
10