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Chapter 4 Parameter Settings|DD Series
4-69
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
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 ‘:’
‘0’ ‘0’
Address
‘1’
Address
‘1’
‘0’ ‘0’
Function
‘3’
Function
‘3’
‘2’ ‘0’
‘1’
Number of data
(count by byte)
‘4’
‘0’ ‘1’
Starting address
‘2’ ‘7’
‘0’ ‘7’
‘0’
Content of starting
address 2102H
‘0’
‘0’ ‘0’
Number of data
(count by word)
‘2’ ‘0’
‘D’ ‘0’
LRC Check
‘7’
Content of address 2103H
‘0’
CR ‘7’
END
LF
LRC Check
‘1’
CR
END
LF
RTU mode:
Command message: Response message:
Address 01H Address 01H
Function 03H Function 03H
21H
Starting data address
02H
Number of data
(count by byte)
04H
00H 17H Number of data
(count by world)
02H
Content of data
address 2102H
70H
CRC CHK Low 6FH 00H
CRC CHK High F7H
Content of data
address 2103H
00H
CRC CHK Low FEH
CRC CHK High 5CH