Delta ASDA-B2-F Series User Manual page 190

ASDA-B2-F
11-bit character frame (for 8-bit character)
8N2
8E1
8O1
Communication Data Structure
Definitions of data frame for ASCII and RTU mode are as below:
ASCII Mode:
Start
Slave Address
Function
Data (n-1)
.......
Data (0)
LRC
End 1
End 0
The start character of communication in ASCII mode is colon ‟:" (ASCII code: 3AH). Slave
address is constituted by two characters in ASCII code. The end code is CR (Carriage Return)
and LF (Line Feed). The communication address, function code, data content and error checking
LRC (Longitudinal Redundancy Check), etc. are between the start character and end code.
September, 2015
L
Start
0 1 2
bit
8-data bits
L
Start
0 1 2
bit
8-data bits
11-bit character frame
L
Start
0 1 2
bit
8-data bits
11-bit character frame
Start character ‟:" (3AH)
Communication address: 1 byte consists of 2 ASCII codes
Function code: 1 byte consists of 2 ASCII codes
Data content: n word = n x 2 byte = consists of n x 4 ASCII codes, n<=10
Error check: 1 byte consists of 2 ASCII codes
End code 1: (0DH)(CR)
End code 0: (0AH)(LF)
3 4 5 6
11-bit character frame
3 4 5 6
3 4 5 6
Communications
H
Stop Stop
7
bit bit
H
Even Stop
7
parity bit
H
Odd Stop
7
parity bit
8
8-5