Mitsubishi Electric MELSEC iQ-R Series User Manual page 418

Ex.
Example of data transmission after automatic removal of NULL characters using the bidirectional protocol
Target device
Head data
E
N
Q
05
H
25 AUTOMATIC REMOVAL OF NULL CHARACTERS INCLUDED IN SEND DATA
416
25.5 NULL Characters Removal for Send Data using Bidirectional Protocol
Arbitrary data (Data transmission)
Data Data Sum
check
length portion
code
L H L H
1 2 3 A B C
06 00 31 32 33 41 42 43 62 01
H H H H H H H H H
(Transmitting a
Head data
response message)
N A
Send
Error
A C
code
K K
or
L H
15 34 12 06
H H H H
C24
Buffer memory (transmission area/reception area)
(H)
(0008H)
00
H
Send (3231H)
32
NULL
H
characters
(0033H)
00
automatic
H
deletion
(4241H)
42
H
(0043H)
00
H
H
When normal:000H
When abnormal: 1234H
(L)
Transmission data count
08
H
31
H
33
H
Transmission data
41
H
43
H
Reception result