Vicruns VD500 Series, Instruction Manual

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Communication Protocol VD500 Series Inverter User Manual
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9.6.2 Command Code: 06H (0000 0110), write one word
Such as: Put 5000(1388H) (namely write-in setting frequency 50.00Hz) write to slave address 01H
inverter 3001H (communication set frequency address). The frame structure description as below:
RTU Master command information.
START T1-T2-T3-T4
ADDR 01H
CMD 06H
Write data address high Bit 30H
Write data address low Bit 01H
Data content high Bit 13H
Data content low Bit 88H
CRC CHK low Bit DAH
CRC CHK high Bit 5CH
END T1-T2-T3-T4
RTU slave response information.
START T1-T2-T3-T4
ADDR 01H
CMD 06H
Write data address high Bit 30H
Write data address low Bit 01H
Data content high Bit 13H
Data content low Bit 88H
CRC CHK low Bit DAH
CRC CHK high Bit 5CH
END T1-T2-T3-T4
9.6.3 Communication Format Error Check Method
Frame error check mode includes two part verification, Bit check of byte (odd/even verify) and CRC
check of complete data of format.
9.6.3.1 Byte check
User can select different check mode according to requirement, can also select no-check, but it will
affect the Bit setting of every byte check.
Even parity check: add a Bit of even parity check before data transmission, to express the number of
“1” in the transmission data is odd or even, if the number is even, check Bit is “0”, otherwise it “1”. This
is to Keeping the parity of the data unchanged.
Odd parity check: add a Bit of odd parity check before data transmission, to express the number of “1”
in the transmission data is odd or even, if the number is odd, check Bit is “0”, otherwise it “1”. This is
to Keeping the parity of the data unchanged.
For example, the transmitting data “11001110”, there is 5 “1” in the data, if using even parity check,
the even check Bit is “1”, if using odd parity check, the odd check Bit is “0”, when transmitting, the