Delta CT2000 Series User Manual page 327

Chapter 12 Description of Parameter SettingsCT2000 Series
（7 , O , 1）
Start
bit
11-bit character frame (For RTU):
（8 , N , 2）
Start
bit
（8 , E , 1）
Start
bit
（8 , O , 1）
Start
bit
2. Communication Protocol
Communication Data Frame: ASCII mode
STX
Address Hi
Address Lo
Function Hi
Function Lo
DATA (n-1)
.......
DATA 0
LRC CHK Hi
LRC CHK Lo
END Hi
END Lo
Communication Data Frame: RTU mode
START
Address
Function
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 =
Communication address:
8-bit address consists of 2 ASCII codes
Command code:
8-bit command consists of 2 ASCII codes
Contents of data:
Nx8-bit data consist of 2n ASCII codes
n<=16, maximum of 32 ASCII codes
LRC check sum:
8-bit check sum consists of 2 ASCII codes
End characters:
END1= CR (0DH), END0= LF(0AH)
A silent interval of more than 10 ms
Communication address: 8-bit address
Command code: 8-bit command
5
3 4
3 4 5
3 4 5
3 4 5
':' (3AH)
12.1-09-3
Odd
Stop
6
parity
bit
Stop
Stop
6
7
bit
bit
Even
Stop
6
7
parity
bit
Odd
Stop
6
7
parity
bit