Delta ASDA-A2 Series User Manual page 583

A2
ASDA-
7O1
Start
bit
11-bit character frame (For 8-bit character)
8N2
Start
bit
8E1
Start
bit
8O1
Start
bit

Communication Protocol
ASCII Mode:
Start
Slave Address
Function
Data (n-1)
.......
Data (0)
LRC
End 1
End 0
The communication protocol of ASCII mode starts from a start character ': ' (3AH). ADR is 1-
byte consists of 2 ASCII codes. CR (Carriage Return) and LF (Line Feed) is a special sequence
of characters signifying the end. There are communication address, function code, contents
of data and LRC (Longitudinal Redundancy Check) between Start and End.
9-8
0 1
2
7-data bits
10-bits character frame
0 1 2
8-data bits
11-bits character frame
0 1 2
8-data bits
11-bits character frame
0 1
2
8-data bits
11-bits character frame
Start character ': ' (3AH)
Communication address: 1-byte consists of 2 ASCII codes
Function code: 1-byte consists of 2 ASCII codes
Contents of data: n word = n x 2-byte consists of n x 4 ASCII codes
n10
Error checking: 1-byte consists of 2 ASCII codes
End code 1: (0DH)(CR)
End code 0: (0AH)(LF)
3 4 5
3 4 5
3 4 5
3 4 5
Chapter 9 Communications
Odd
Stop
6
parity
bit
Stop
Stop
6
7
bit
bit
Even
Stop
6
7
parity
bit
Odd
Stop
6
7
parity
bit
Revision September 2012