Delta Electronics VFD-M - Manual (Page 97)

Chapter 4 Parameters|
4-62 Revision May 2008, ME14, SW V3.04
RTU mode:
START A silent interval of more than 10 ms
ADR Communication address: 8-bit address
CMD Command code: 8-bit command
DATA (n-1)
…….
DATA 0
Contents of data: n ×8-bit data, n<=25
CRC CHK Low
CRC CHK High
CRC check sum:
16-bit check sum consists of 2 8-bit characters
END A silent interval of more than 10 ms
3.3 ADR (Communication Address)
Valid communication addresses are in the range of 0 to 254. An address equals to 0
means a broadcast to all AC drives (AMD) in the network. In this case, the AMD will not
reply to the master device.
For example, communication to AMD with address 16 decimal:
ASCII mode: (ADR 1, ADR 0)=’1’,’0’ => ‘1’=31H, ‘0’=30H
RTU mode: (ADR)=10H
3.4 Function (Function code) and DATA (data characters)
The format of data characters depends on the function code. The available function codes
are described as follows:
03H: read data from register
06H: write single data to register
10H: write multiple data to registers