
C7355A ROOM IAQ MONITOR
5
31-00434—01
Table 1. Modbus Register Table.
Starting
Register
Decimal
Data Description
Function
Read/
Write
Quantity of
Registers
(2Bytes/16bit)
Format
Decimals
Data Range,
Data Description
Default
0/1050
PM2.5 hourly average
measurement
4 R
2
Float-Big
Endian
1
0–1000.0
μ
g/m
3
2/1052
PM10 hourly average
measurement
4 R
2
Float-Big
Endian
1
0–1000.0
μ
g/m
3
8/1058 CO
2
hourly average
measurement
4 R
2
Float-Big
Endian
0 0–5,000 ppm
10/1060 TVOC
hourly
average
measurement
4 R
2
Float-Big
Endian
3
0–4000 mg/m
3
12/1000 PM2.5 one minute
average measurement
4 R
2
Float-Big
Endian
1
0–1000.0
μ
g/m
3
14/1002 PM10 one minute
average measurement
4 R
2
Float-Big
Endian
1
0–1000.0
μ
g/m
3
16/1004 Temperature
real-time
measurement
4 R
2
Float-Big
Endian
2 -20.00 °C–60.00 °C
18/1006 Humidity
real-time
measurement
4 R
2
Float-Big
Endian
2 0–100.00%
RH
20/1008 CO
2
real-time
measurement
4 R
2
Float-Big
Endian
0 0–5,000 ppm
22/1010 TVOC
real-time
measurement
4 R
2
Float-Big
Endian
3
0–4000 mg/m
3
24/1100 PM2.5 24-hour moving
average measurement
4 R
2
Float-Big
Endian
1
0–1000.0
μ
g/m
3
26/1102 PM10 24-hour moving
average measurement
4 R
2
Float-Big
Endian
1
0–1000.0
μ
g/m
3
32/1108 CO
2
24-hour moving
average measurement
4 R
2
Float-Big
Endian
0
0–5,000 ppm
34/1110 TVOC 8-hour moving
average measurement
4 R
2
Float-Big
Endian
3
0–4000 mg/m
3
1300
Primary pollutant 24-
hour average
measuring value (One
of PM2.5/PM10/CO
2
/
TVOC) (Calculated
based on 24-hour or
1-hour moving average
measurement)
4 R
2
Float-Big
Endian
1300
1302
Primary pollutant type
(One of
PM2.5/PM10/CO
2
/
TVOC) (Calculated
based on 24-hour or
1-hour moving average
measurement)
4 R
1
INT16
1-PM25,
2-PM10,
3-CO
2
; 4-TVOC
1303
Index level of the
primary pollutant (One
of PM2.5/PM10/CO
2
/
TVOC) (Calculated
based on 24-hour or
1-hour moving average
measurement)
4
R 1
INT16
Level
1-Excellent
Level 3-Light
pollution
Level4-Medium
pollution
Level 5-Heavy
pollution
Level 6-Severe
pollution