激光粉尘传感器系列

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B. Calculate method:

Data frames: 42 4D 00 1C 00 54 00 6E 00 7C 00 54 00 6E 00 7C 00 00 00 00 00 00 00 00 00 00 00

00 00 00 03 27

Check value=

0x42+0x4D+0x00+0x1C+0x00+0x54+0x00+0x6E+0x00+0x7C+0x00+0x54+0x00+0x6E+0x00

+0x7C+0x00+0x00+0x00+0x00+0x00+0x00+0x00+0x00+0x00+0x00+0x00+0x00+0x00+0x00=

0x0327

0x03 of High level 8 is in 31 byte of data frame, 0x27 of Low level 8 is in 32 byte of data frame.

User sends command:

0

1

2

3

4

5

6

7

8

Starting Reserve

command reserve reserve reserve reserve

reserve Check value

0XFF

0x01

0x86

0x00

0x00

0x00

0x00

0x00

0x79

Return value as follow:

Note: The question-and-answer data frame check value calculation method is different from the

method for initiative upload data frames. Please refer to the question-and-answer check value

calculation example code.

4. Switch between Q&A mode and Initiative upload mode

User sends command: set Q&A mode:

0

1

2

3

4

5

6

7

8

Starting Reserve command Q&A

Reserve

Reserve Reserve

Reserve Check value

0XFF

0x01

0x78

0x41

0x00

0x00

0x00

0x00

0x46

User sends command: Set initiative upload mode

0

1

2

3

4

5

6

7

8

Starting Reserve Command Upload Reserve Reserve Reserve

Reserve Check value

0xFF

0x01

0x78

0x40

0x00

0x00

0x00

0x00

0x47

Note: Please refer to the sample code for calculating the data frame check value.

0

1

2

3

4

5

6

7

8

StartingCommand

PM2.5(ug/m3)

PM10(ug/m3)

PM1.0(ug/m3)

High 8 Level Low 8 LevelHigh 8 Level Low 8 Level High 8 Level Low 8 Level Check value

0xFF

0x86

0x00

0x85

0x00

0x96

0x00

0x65

0xFA