Communication Data Frame; Address (Communication Address); Function (Function Code) And Data (Data Characters) - Delta VFD-B User Manual

3.1 Communication Data Frame:

ASCII mode:
RTU mode:
CRC CHK High

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
For example, communication to AMD with address 16 decimal (10H):
ASCII mode: Address='1','0' => '1'=31H, '0'=30H
RTU mode: Address=10H

3.3 Function (Function code) and DATA (data characters)

The format of data characters depends on the function code.
03H: read data from register
Revision July 2008, BE16, SW V4.08 & V5.00
STX Start character ':' (3AH)
Address Hi Communication address:
8-bit address consists of 2 ASCII codes
Address Lo
Function Hi Command code:
8-bit command consists of 2 ASCII codes
Function Lo
DATA (n-1) Contents of data:
to Nx8-bit data consist of 2n ASCII codes
DATA 0 n<=20, maximum of 40 ASCII codes
LRC CHK Hi LRC check sum:
8-bit check sum consists of 2 ASCII codes
LRC CHK Lo
END Hi End characters:
END1= CR (0DH), END0= LF(0AH)
END Lo
START A silent interval of more than 10 ms
Address Communication address: 8-bit address
Function
Command code: 8-bit command
DATA (n-1)
Contents of data:
to
n×8-bit data, n<=40 (20 x 16-bit data)
DATA 0
CRC CHK Low
CRC check sum:
16-bit check sum consists of 2 8-bit characters
END A silent interval of more than 10 ms
Chapter 5 Parameters|VFD-B Series
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