1 Temperature and Humidity reading
.
Send command:
Address
Command
Length
CRC
01
03
00
00
00
02
C4
0B
Temperature and Humidity value
CRC
Return command:
01
03
04
01
0F
01
EF
Note:
Red is Temperature value
01
0F
Decimal is 27.1C
01
EF
Decimal is 49.5%
2. C
reading
O
2
CRC
01
03
00
05
00
01
94
0B
CRC
01
03
02
03
E8
03
E8
1000ppm
3.
CO
2
PV adjustment
Send command (
):
C
PV adjustment 500ppm
O
2
Value
CRC
01
06
00
06
01
F4
Function code: 03
Parameter
Address
Command
Length
Address
Command
Length
Parameter
Send command:
Return command:
C
value
O
2
Address
Command
Length
Function code: 03
Note:
Address
Command
Parameter
Blue is Humidity value
Red is CO value
2
Decimal is
Function code
6
: 0
3
RS485 communication connection error troubleshooting
1. Please check USB/322 Comport adress in computer device manager is set correctly.
2. Please check the transmission formats that the system support: N81, N82, E81, O81 are set correctly.
3. Please check the baud rate: 9600 or 19200 or 38400 or 57600 or 115200 are set correctly.
4. Please check RS485 address: 1 to 255 are set correctly.
5. Please check RS485 positive and negative connection of the meter are connected correctly.