Basic Documentation

Configurations
Modbus configuration parameters
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4 Configurations
4.1 Modbus configuration parameters
The sensor is a Modbus (RS485) slave device, configurable via a Modbus master.
Name Range / Enumeration Default
Configurable Address 1...247 1
Baud rate (bps) 1 = 9600 / 2 = 19200/
3 = 38400 / 4 = 57600
19200
Transmission format 0 = 1-8-E-1 / 1 = 1-8-O-1 /
2 = 1-8-N-1 / 3 = 1-8-N-2
0
Basic Parity Even / Odd / No Even
Stop bits 1 / 2 1
Connection <= 32pcs/line
Data 8 bits (0-255)
Identity Slave
Cable length <600m
4.2 Modbus registers (Software version 1.2.12)
The following Modbus registers are used in software version 1.2.12 and previous.
Holding
Register
(16-bit)
No.
Name Description Default R/W
257 PM2.5 value Range: 0…500 R
258 PM10 value Range: 0…500 R
260 Sensor working status 0: Normal;
1: Replace sensor
module;
2: Communication
error
R
296 Software version Major version R
297 Software version Minor version R
298 Software version Build version R