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Specification of high-performance vector convertor
RTU frame format
Frame header START
Slave ADR
CMD code
DATA (N-1)
DATA (N-2)
......
DATA0
CRC CHK high-order Detection value: CRC value
CRC CHK low-order
END
and
CMD
DATA
CMD code: 03H, read N word (12 words at most). For example: start address F002 of frequency
convertor with slave address being 01 reads 2 values successively
CMD message of host
ADR
CMD
Start address high-order
Start address low-order
Register No. high-order
Register No. low-order
CRC CHK high-order
CRC CHK low-order
Response message of slave
is set as
:
PD-05
0
ADR
CMD
Byte No. high-order
Byte No. low-order
Data F002H high-order
Data F002H low-order
Data F003H high-order
Data F003H low-order
CRC CHK low-order
CRC CHK high-order
Time of 3.5 characters
Address: 1~247
03: read slave parameters; 06: write slave parameters
Data content: address of function code parameters, number
of function code parameters, value of function code
parameters, etc
Time of 3.5 characters
01H
03H
F0H
02H
00H
02H
CRC CHK value to be calculated
01H
03H
00H
04H
00H
00H
00H
01H
CRC CHK value to be calculated
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Appendix
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