Communication Data Frame; Address - Delta VFD-B Series Manual

Chapter 5 Parameters VFD-B Series
3. Communication Protocol

3.1 Communication Data Frame:

ASCII mode:
STX
Address Hi
Address Lo
Function Hi
Function Lo
DATA (n-1)
to
DATA 0
LRC CHK Hi
LRC CHK Lo
END Hi
END Lo
RTU mode:
START

Address

Function
DATA (n-1)
to
DATA 0
CRC CHK Low
CRC CHK High
END
3.2 Address (Communication Address)
Valid communication addresses are in the range of 0 to 254. A communication address equal to 0,
means broadcast to all AC drives (AMD). In this case, the AMD will not reply any message to the
master device.
00H: broadcast to all AC drives
01H: AC drive of address 01
0FH: AC drive of address 15
10H: AC drive of address 16
:
FEH: AC drive of address 254
5-94
Start character ':' (3AH)
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<=20, maximum of 40 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
Contents of data:
n 8-bit d ata, n<=40 (20 x 16-bit data)
CRC check sum:
16-bit check sum consists of 2 8-bit characters
A silent interval of more than 10 ms
Revision 10/2005, BE13, SW V4.08