5-44
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
Command code: 03H, read N words. The maximum value of N is 12. For example,
reading continuous 2 words from starting address 2102H of AMD with address 01H.
ASCII mode:
Command message: Response message:
STX ‘:’ STX ‘:’
‘0’ ‘0’ ADR 1
ADR 0
‘1’
ADR 1
ADR 0
‘1’
‘0’ ‘0’ CMD 1
CMD 0
‘3’
CMD 1
CMD 0
‘3’
‘2’ ‘0’
‘1’
Number of data
(count by byte)
‘4’
‘0’ ‘1’
Starting data
address
‘2’ ‘7’
‘0’ ‘7’
‘0’
Content of starting
data address
2102H
‘0’
‘0’ ‘0’
Number of data
(count by word)
‘2’ ‘0’
‘D’ ‘0’ LRC CHK 1
LRC CHK 0
‘7’
Content of data
address 2103H
‘0’
CR ‘7’ END 1
END 0
LF
LRC CHK 1
LRC CHK 0
‘1’
CR
END 1
END 0
LF
B550 Series sensorless vector frequency drive
To Next Page
Loading...
