Datasheet

5
Sensing and Internet of Things
Particulate Matter Sensors
HPM Series
Table 5. Standard Version Data Format (Protocol Length: 32 Bytes)
Byte Number Head0 Head0 Head0
Byte0 Head0 0x42
fixed
Byte1 Head1 0x4d
Byte2 Len_H
Frame Length = 2x13+2(data length + checksum length)
Byte3 Len_L
Byte4 Data0_H
reserve
Byte5 Data0_L
Byte6 Data1_H
PM2.5 concentration (standard particulate matter)
By te7 Data1_L
Byte8 Data2_H
PM10 concentration (standard particulate matter)
Byte9 Data2_L
Byte10 Data3_H
reserve
Byte11 Data3_L
Byte12 Data4_H
reserve
Byte13 Data4_L
Byte14 Data5_H
reserve
Byte15 Data5_L
Byte16 Data6_H
reserve
Byte17 Data6_L
Byte18 Data7_H
reserve
Byte19 Data7_L
Byte20 Data8_H
reserve
Byte21 Data8_L
Byte22 Data9_H
reserve
Byte23 Data9_L
Byte24 Data10_H
reserve
Byte25 Data10_L
Byte26 Data11_H
reserve
Byte27 Data11_L
Byte28 Data12_H
reserve
Byte29 Data12_L
Byte30 CheckSum_H
Checksum = Head0+Head1+Len_H+Len_L+Data0_H+…+Data12_L
Byte31 CheckSum_H