Delta Electronics VFD-F Series manual ASCII mode, RTU mode

VFD-F Series

3.Communication Protocol

3.1Communication Data Frame:

ASCII mode:

STX

ADR 1

ADR 0

CMD 1

CMD 0

DATA (n-1)

…….

DATA 0

LRC CHK 1

LRC CHK 0

END 1

END 0

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:

N X 8-bit data consists of 2n ASCII codes. n<=25, maximum of 50 ASCII codes

LRC check sum:

8-bit check sum consists of 2 ASCII codes

End characters:

END1= CR (0DH), END0= LF(0AH)

5

RTU mode:

START

ADR

CMD

DATA (n-1)

…….

DATA 0

CRC CHK Low

CRC CHK High

END

A silent interval of more than 10 ms Communication address: 8-bit address Command code: 8-bit command

Contents of data:

N X 8-bit data, n<=25

CRC check sum:

16-bit check sum consists of 2 8-bit characters A silent interval of more than 10 ms

3.2ADR (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.

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

3.3CMD (command code) and DATA (data character)

The format of data characters depends on the command code. The available command codes are described as followed:

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