136 lines
5.0 KiB
Plaintext
136 lines
5.0 KiB
Plaintext
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Output result
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Mainly output as the quality and number of each particles with different size
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per unit volume, the unit volume of particle number is 0.1L and the unit of
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mass concentration is μ g/m³.
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There are two options for digital output: passive and active. Default mode
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is active after power up. In this mode sensor would send serial data to the
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host automatically .The active mode is divided into two sub-modes: stable
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mode and fast mode. If the concentration change is small the sensor
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would run at stable mode with the real interval of 2.3s.And if the change is
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big the sensor would be changed to fast mode automatically with the
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interval of 200~800ms, the higher of the concentration, the shorter of the
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interval.
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Circuit Attentions
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1) DC 5V power supply is needed because the FAN should be driven by 5V.
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But the high level of data pin is 3.3V. Level conversion unit should be
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used if the power of host MCU is 5V.
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2) The SET and RESET pins are pulled up inside so they should not be
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connected if without usage.
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3) PIN7 and PIN8 should not be connected.
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4) Stable data should be got at least 30 seconds after the sensor wakeup
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from the sleep mode because of the fan’s performance.
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Installation Attentions
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1) Metal shell is connected to the GND so be careful not to let it shorted with
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the other parts of circuit except GND.
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2) The best way of install is making the plane of inset and outset closely to
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the plane of the host. Or some shield should be placed between inset and
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outset in order to prevent the air flow from inner loop.
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3) The blowhole in the shell of the host should not be smaller than the inset.
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4) The sensor should not be installed in the air flow way of the air cleaner or
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should be shielded by some structure.
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5) The sensor should be installed at least 20cm higher than the grand in
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order to prevent it from blocking by the flock dust.
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6) Do not break up the sensor.
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Other Attentions
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1) Only the consistency of all the PM sensors of PLANTOWER is promised
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and ensured. And the sensor should not be checked with any third party
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equipment.
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2) The sensor is usually used in the common indoor environment. So some
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protection must be added if using in the conditions as followed:
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a) The time of concentration ≥300μ g/m³ is longer than 50% of the
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whole year or concentration≥500μ g/m³ is longer than20% of the
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whole year.
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b) Kitchen
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c) Water mist condition such as bathroom or hot spring.
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d) outdoor
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Appendix I：PMS7003 transport protocol-Active Mode
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Default baud rate：9600bps Check bit：None Stop bit：1 bit
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32 Bytes
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Start character 1 0x42 (Fixed)
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Start character2 0x4d (Fixed)
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Frame length high
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8 bits
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…… Frame length=2x13+2(data+check bytes)
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Frame length low 8
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bits
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……
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Data 1 high 8 bits …… Data1 refers to PM1.0 concentration unit
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μ g/m3（CF=1，standard particle）*
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Data 1 low 8 bits ……
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Data2 high 8 bits …… Data2 refers to PM2.5 concentration unit
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μ g/m3（CF=1，standard particle）
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Data2 low 8 bits ……
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Data3 high 8 bits …… Data3 refers to PM10 concentration unit
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μ g/m3（CF=1，standard particle）
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Data3 low 8 bits ……
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Data4 high 8 bits …… Data4 refers to PM1.0 concentration unit *
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μ g/m3（under atmospheric environment）
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Data4 low 8 bits ……
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Data5 high 8 bits …… Data 5 refers to PM2.5 concentration unit
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μ g/m3（under atmospheric environment）
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Data5 low 8 bits ……
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Data6 high 8 bits ……. Data 6 refers to concentration unit (under
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atmospheric environment) μ g/m3 Data6 low 8 bits ……
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Data7 high 8 bits …… Data7 indicates the number of
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particles with diameter beyond 0.3 um
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in 0.1 L of air. Data7 low 8 bits ……
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Data8 high 8 bits …… Data 8 indicates the number of
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particles with diameter beyond 0.5 um
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in 0.1 L of air. Data8 low 8 bits ……
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Data9 high 8 bits …… Data 9 indicates the number of
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particles with diameter beyond 1.0 um
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in 0.1 L of air.
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Data9 low 8 bits ……
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2016 product data manual of PLANTOWER
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Data10 high 8 bits …… Data10 indicates the number of
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particles with diameter beyond 2.5 um
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in 0.1 L of air.
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Data10 low 8 bits ……
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Data11 high 8 bits …… Data11 indicates the number of
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particles with diameter beyond 5.0 um
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Data11 low 8 bits …… in 0.1 L of air.
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Data12 high 8 bits …… Data12 indicates the number of
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particles with diameter beyond 10 um
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Data12 low 8 bits …… in 0.1 L of air.
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Data13 high 8 bits …… Data13 Reserved
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Data13 low 8 bits ……
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Data and check
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high 8 bits
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…… Check code=Start character1+ Start
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character2+……..+data13
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Low 8 bits
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Data and check
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low 8 bits
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……
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Note: CF=1 should be used in the factory environment
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.
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2016 product data manual of PLANTOWER
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Appendix II：PMS7003 transport protocol-Passive Mode
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Default baud rate：9600bps Check bit：None Stop bit：1 bit
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Host Protocol
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Start Byte
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1
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Start Byte
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2
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Command Data 1 Data 2 Verify Byte
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1
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Verify Byte
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2
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0x42 0x4d CMD DATAH DATAL LRCH LRCL
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1. Command Definition
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CMD DATAH DATAL
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0xe2 X X Read in passive
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mode
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0xe1 X 00H-passive
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01H-active
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Change mode
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0xe4 X 00H-sleep
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01H-wakeup
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Sleep set
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2. Answer
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0xe2: 32 bytes , same as appendix I
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3. Verify Bytes :
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Add of all the bytes except verify bytes.
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