Configurations
Modbus configuration parameters
4
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A6V11160936_en--_c
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
