Chapter 4 Parameters
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LRC CHK Hi
LRC check sum:
8-bit check sum consists of 2 ASCII codes
LRC CHK Lo
END Hi
End characters:
END1= CR (0DH), END0= LF(0AH)
END Lo
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)
to
DATA 0
Contents of data:
n
×
8-bit data, n<=40 (20 x 16-bit data)
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
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
08H: loop detection
10H: write multiple registers
