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6.4. Application
Environmental monitoring in a community library
For monitoring indoor air quality including temperature, humidity, CO, CO2 and PM2.5 concentration
in a community library which has a lobby, a journal room, a reading room, a multimedia center and a
stack room, one MDCL-705i and five CL-213 modules are used and deployed as shown below.
The following table shows the Modbus address for reading data from the CL-213 devices. This section
will explain how to set the MDCL-705i to collect temperature, humidity, CO, CO2 and PM2.5
concentration information and their high alarm status from CL-213 devices
.
Function Code
Register
Data
Unit
0x04 (Read AI)
300000
CO
1ppm
300001
CO2
1ppm
300002
PM2.5
1ug/m
3
300003
Humidity
0.01%
300004
Temperature
0.01°C
0x03 (Read AO)
400452
Temperature offset
0.01°C
0x01 (Read DO),
(Write 1 to clear
alarm status)
000304
High alarm status of CO
000305
High alarm status of CO2
000306
High alarm status of PM2.5
000307
High alarm status of Humidity
000308
High alarm status of Temperature
Lobby
(101)
Reading Room
(103)
Journal
Room
(102)
Multimedia
Center
(104)
Stack Room
(105)
COM2
COM1
