PMD 351
Aerosol (Mass) Monitor
User Manual
RS-485
RS-485
RS-485
RS-485 Serial Port
32
6.0
PMD 351 supports two communication modes: RS-485 and USB.
RS-485 serial communication is used for real-time interaction.
USB communication is used to export data history.
RS-485
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x10
0x11
0x12
N/A
N/A
N/A
PM1.0 Hi 16
PM1.0 Lo 16
PM2.5 Hi 16
PM2.5 Lo 16
PM4 Hi 16
PM4 Lo 16
PM10 Hi 16
PM10 Lo 16
TSP Hi 16
TSP Lo 16
Reserved
Reserved
Reserved
Concentration value
Concentration value
Concentration value
Concentration value
Concentration value
Concentration value
Concentration value
Concentration value
Concentration value
Concentration value
Reading measurement data
The sensor address is 0xFE.
Use 0x04 (read input register) in Modbus to obtain detected data.
The detected data put in a register with a starting address of 0x0003, the number of registers
is 10, and the CRC check is 0x9402.
The PMD351 responds a value that is 10 times the actual concentration. In the example:
PM1.0 is 0x000000CF (actual value is 20.7 µg/m
3
),
PM2.5 is 0x00000138 (actual value is 31.2 µg/m
3
),
PM4.0 is 0x0000018F (actual value is 39.9 µg/m
3
)
PM10 is 0x000001F5 (actual value is 50.1 µg/m³)
TSP is 0x00000241 (actual value is 57.7 µg/m
3
).
0x0A
0x020x94
Slave
Address
Function
Code
Starting
Address
Hi
Starting
Address
Lo
Quantity
Hi
Quantity
Lo
CRC16
Lo
CRC16
Hi
0x03
PM2.5
Lo 16 Hi
0x01 0x8F0x00
PM4.0
Lo 16 Lo
PM4.0
Lo 16 Hi
PM2.5
Lo 16 Lo
PM4.0
Hi 16 Hi
PM4.0
Hi 16 Lo
0x38 0x00 0x01
PM1.0
Lo 16 Lo
PM2.5
Hi 16 Lo
0x00 0xCF 0x00
PM2.5
Hi 16 Hi
0x000x00
PM1.0
Lo 16 Hi
PM1.0
Hi 16 Lo
0x00
0x14
PM1.0
Hi 16 Hi
Function
Code
Quantity
Slave
Address
PM10
Lo 16 Hi
PM10
Hi 16 Hi
PM10
Hi 16 Lo
PM10
Lo 16 Lo
0xF5 0x990x00
CRC16
Lo
TSP
Lo 16 Lo
TSP
Hi 16 Hi
TSP
Hi 16 Lo
TSP
Lo 16 Hi
0x00 0x02 0x41
CRC16
Hi
0x00 0x010x00
0xA0
0~50mg/m
3
485
8
V1.3
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