RS485 PM2.5/PM10 Sensor Modbus Particle Detection Sensor Transmitter Air Quality Detection

Features
1. PM2.5, PM10 output at the same time
2.unique dual-band data acquisition and automatic calibration technology, high consistency
3. the use of advanced laser anti-attenuation technology to ensure long-term stability of equipment
4.the device is 10-30V DC wide voltage Power supply, standard Modbus-RTU protocol
Specification
DC power supply (default):10-30VDC
Transmitter circuit Operating temperature:-20C-60C, 0% RH-80% RH
Communication interface
485 communication (modbus) protocol baud rate:2400.4800 (default) .9600
Data bit length:8 bits
Parity mode:none
Stop bit length:1 bit
Default modbus communication address:1
Support function code:03Parameter settings:Configured with the supplied configuration software via the 485 interface
Resolution:0.1ug / cubic meter
Measuring range:PM2.5 / PM10 0-1000ug / cubic meter
Response speed
Warm-up time
Wiring instructions:Cable color:Description
Power:Brown:Power+ (10-30vdc )
black:Power –
Communication:yellow:485-A
Blue:485-B
Communication protocol
Basic communication parameters
Code:8-bit binary
Data bit:8 bit
Parity bit:NO
Stop bit:1 bit
Error check:CRC
Baud rate:2400bit/s, 4800bit/s, 9600 bit/s default is 4800bit/S
4.2 Data frame format definition
Adopt Modbus-RTU communication protocol, the format is as follows
Initial structure ≥ 4 bytes of time
Address code = 1 byte
Noise Transmitter Instruction Manual (Type 485) V2.0
Function code = 1 byte
Data area = N bytes
Error check = 16-bit CRC code
End structure ≥ 4 bytes of time
Address code:is the address of the transmitter, which is unique in the communication network (factory default 0x01).
Function code:The instruction function of the command sent by the host. This transmitter only uses function code 0x03 (read register data).
Data area:The data area is the specific communication data. Note that the 16bits data high byte is in front!
CRC code:Two-byte check code.
Host inquiry frame structure
Address code:Function code:Register start address:Register length:check code low:Check code high
1 bytes:1 bytes:2 bytes:2 bytes:1 bytes:1 bytes
Slave transponder frame structure
Address code:Function code:effective byte:No 1 Data area:NO2 Data area:No N Data area:Check code
1 bytes:1 bytes:1 bytes:2 bytes:2 bytes:2 bytes:2 bytes
Register address
Register address:PLC or configuration address:content:operation
0000 H:40001:PM2.5
Upload data is the real value:Read only
0000 H:40002:PM10
Upload data is the real value:Read only
4.4 Communication protocol examples and explanations
Example:Read the PM value of device address 0x01
Inquiry frame
Address code:Function code:Start address:Data length:check code low:Check code high
0x01:0x03:0x00 0x00:0x00 0x02:0xC4:0x0B
Response frame:(eg read 85ug/m3 for PM2.5 and 156ug/m3 for PM10)
Address code:Function code:effective byte:humidity:temperature:check code low:Check code high
0x01:0x03:0x04:0x00 0x55:0x00 0x9c:0xEA:0x4A
PM2.5 calculation
Air quality (PM2.5/P10) transmitter instruction manual (type 485) V2.0
PM2.5:0055 H (hexadecimal) = 85=> PM2.5 = 85ug/m3
PM10 calculation
PM10:009CH (hexadecimal) = 156 => PM10 = 156ug/m3
Package includes
1x PM2.5/PM10 Sensor
Details Pictures: