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Starting
Register
Decimal
Data Description
1304
AQI value of the primary
pollutant) (One of
PM2.5/PM10/CO
TVOC) (Calculated based on
24-hour or
1-hour moving average
measurement)
1320
PM2.5 AQI value (Calculated
based on 24-hour moving
average measurement)
1321
PM10 AQI value (Calculated
based on 24-hour moving
average measurement)
1322
CO
AQI value (Calculated
2
based on 24-hour moving
average measurement)
1323
TVOC AQI value (Calculated
based on 24-hour moving
average measurement)
1350
PM2.5 Pollution index level
(Calculated based on 24-hour
moving average measurement)
1351
PM10 Pollution index level
(Calculated based on 24-hour
moving average measurement)
1352
CO
Pollution index level
2
(Calculated based on 24-hour
moving average measurement)
1353
TVOC Pollution index level
(Calculated based on 24-hour
moving average measurement)
78
3 color LED status
0
Modbus Address
1
Modbus rate (bps)
2
Modbus Parity check bit
4
Temperature correction value
6
Humidity correction value
14
CO
compensation value
2
In order to reserve the decimal part, the measuring value with decimal will be magnified 10/100/1000 times, marked as
x10/x100/x1000.
Table 2. Modbus Register Table.
Read/
Function
Write
4
R
/
2
4
R
4
R
4
R
4
R
4
R
4
R
4
R
4
R
4
R
3/6
R/W
3/6
R/W
3/6
R/W
3/16
R/W
3/16
R/W
3/16
R/W
Quantity of
Registers
(2Bytes/16bit)
Format
1
INT16
1
INT16
1
INT16
1
INT16
1
INT16
1
INT16
1
INT16
1
INT16
1
INT16
1
INT16
1
UINT16
1
UINT16
1
UINT16
2
Float-Big
Endian
2
Float-Big
Endian
2
Float-Big
Endian
7
C7355B IN-DUCT IAQ MONITOR
Data Range,
Decimals
Data Description
0–500
0–500
0–500
0–500
0–500
1–6
1–6
1–6
1–6
0-OFF, 1-Green,
2-Yellow, 3-Red
1–247
1-4800, 2-9600,
3-14400, 4-19200,
5-38400, 6-56000,
7-57600, 8-115200
1-NONE, 1STOP_BIT,
2-NONE, 2STOP_BIT,
3-Odd, 1STOP_BIT,4-
Even, 1STOP_BIT
2
-3.0–3.0 °C/
-6.0–6.0 °F
2
-5.0–5.0%RH
0
-300.0–300.0 ppm
Default
1
2
1
-2.0
0
0
31-00438—01
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