Delta VFD007FP4EA-41 - Page 346

Chapter 12 Description of Parameter Settings|CFP2000 Series
12.1-09-4
Communication Data Frame: RTU mode
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:
n×8-bit data, n<=16
…….
DATA 0
CRC CHK Low
CRC check sum:
16-bit check sum consists of 2 8-bit characters
CRC CHK High
END A silent interval of more than 10 ms
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
Function (Function code) and DATA (data characters)
The format of data characters depends on the function code.
03H: read data from register
06H: write single register
Example: reading continuous 2 data from register address 2102H, AMD address is 01H.
ASCII mode:
Command Message: Response Message
STX ‘:’ STX ‘:’
Address
‘0’
Address
‘0’
‘1’ ‘1’
Function
‘0’
Function
‘0’
‘3’ ‘3’
Starting register
‘2’
Number of register
(count by byte)
‘0’
‘1’ ‘4’
‘0’
Content of starting
register 2102H
‘1’
‘2’ ‘7’
Number of register
(count by word)
‘0’ ‘7’
‘0’ ‘0’
‘0’
Content of register 2103H
‘0’
‘2’ ‘0’
LRC Check
‘D’ ‘0’
‘7’ ‘0’
END
CR
LRC Check
‘7’
LF ‘1’
END
CR
LF