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MELSOFT
6 COMMUNICATION SETTING EXAMPLES OF THE UTILITY SETTING TYPE
(b) Settings by writing values to the special data registers (D8120,
D8121, D8129) in a sequence program.
1) D8120 (Communication format)
b15
D8120
b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
Bit Description Setting details
b0 Data length
0: 7 bit
1: 8 bit
b1
b2
Parity
b2 b1
None 0 0
Odd number 0 1
Even number 1 1
b3 Stop bit
0: 1 bit
1: 2 bit
b4
b5
b6
b7
Transmission
speed
b7 b6 b5 b4
300bps 0 0 1 1
600bps 0 1 0 0
1200bps 0 1 0 1
2400bps 0 1 1 0
4800bps 0 1 1 1
9600bps 1 0 0 0
19200bps 1 0 0 1
b8 0
b9
---
0
b10
b11
H/W type
b11 b10
RS-485 0 0
b12 --- 0
b13 Sum check
0: N/A
1: Available
b14
Communication
protocol
1: Computer link
b15
Transmission
control procedure
0: Form 1