Delta VFD-V Series - Page 97

VFD-V Series
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5-66
The ASCII Mode:
STX
Start Word = ‘：’ (3AH)
Address Hi
Address Lo
Communication Address:
The 8-bit address is composed of 2 ASCll codes
Function Hi
Function Lo
Function Code:
The 8-bit function code is composed of 2 ASCll
codes
DATA (n-1)
…….
DATA 0
Data Contents:
n×8-bit, the data contents is composed of 2n
ASCll codes
n<=16, 32 ASCII codes as the maximum
LRC CHK Hi
LRC CHK Lo
LRC Check Sum:
The 8-bit check sum is composed of 2 ASCll
codes
END Hi
END Lo
End Word:
END Hi = CR (0DH), END Lo = LF(0AH)
The RTU Mode:
START Keep the non-input message greater or equal to
10 ms
Address Communication Address: the 8-bit binary address
Function Function Code: the 8-bit binary address
DATA (n-1)
…….
DATA 0
Data Contents:
n×8-bit data, n<=16
CRC CHK Low
CRC CHK High
CRC Check Sum:
The 16-bit CRC check sum is composed of 2
8-bit binary codes
END Keep the non-input message greater or equal to
10 ms
3.2 Communication Address
00H: all the drives are broadcasting
01H: toward the drive at the 01 address
0FH: toward the drive at the 15 address
10H: toward the drive at the 16 address
and consequently, the maximum to be reached is 254 (FEH).