Honeywell C7355B In-Duct IAQ Monitor
ABOUT
This air quality monitor is specially designed for monitoring multiple air quality parameters in the air duct. The sensor is installed in the outdoor or return air duct. Real time monitoring parameters are particles (PM2.5 and PM10), carbon dioxide (CO2), TVOC, air temperature and relative humidity.
The intelligent control algorithms built into the device help to minimize the influence of ambient temperature and humidity on the measured values. The device is packaged with numerous presets suitable for most commercial building requirements that enable quick and easy initial setup.
The device, with pilot tube inlet and outlet design instead of common air pump, adapts to a wider range of air speeds and ensures a long lifetime of usage. It provides Modbus RTU (RS-485) communication protocol and easily integrates with the building management system.
INITIAL SETUP
The device will power on when voltage is connected.
NOTE: Upon first use or re-use after long time shelving, the device should be continuously powered-on for at least 48 hours to ensure stable output of all measured values.
LIGHT INDICATION
The bottom right side of the device is the indicator area. For this monitor (Part number: C7355B1052), only refer to the ON and SCALE indicators.
 | When the power is on, it will illuminate to indicate the device is working. Otherwise, the device is faulty. |
 | This light indicates the one-minute average value of PM2.5, and changes color depending on concentration. When PM2.5 <35 μg/m3 green light on 35–75 μg/m3 yellow light on >75 μg/m3 red light on |
COMMUNICATION SETTINGS
Wired communication (Modbus RS-485) is available for the device. The wiring terminals are shown below for detailed wiring and installation, please refer to Mounting Instructions.
SPECIFICATIONS
Part Number: C7355B1052
Detection Parameters: PM 2.5/PM 10, CO2, TVOC, Temperature and RH
Operating Environment: 4 °F140 °F (-20 °C60 °C); 099%RH (non-condensing)
Storage Conditions: 32 °F122 °F (0 °C50 °C); 1060%RH
Overall Dimension: 7.09 in x 4.92 in x 2.58 in (180 mm x 125 mm x 65.5 mm)
Net weight: 1.87 lb (850 g)
Certification Standard: CE/FCC
Modbus Register Table
Mode: RTU (MSB First)
Baud Rate:
1-4800
2-9600
3-14400
4-19200
5-38400
6-56000
7-57600
8-115200
default: 2-9600bps
Start Bits: 1
Data Bits: 8
Stop Bits: 1 / 2
default: 1
Parity: None / Odd / Even
default: None
Register Map
Support Function code:
3 – Read Holding Registers
4 – Read Input Registers
6 – Write Single Register
16 – Write Multiple registers
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 μg/m3 | |
| 2/1052 | PM10 hourly average measurement | 4 | R | 2 | Float-Big Endian | 1 | 0–1000.0 μg/m3 | |
| 8/1058 | CO2 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/m3 | |
| 12/1000 | PM2.5 one minute average measurement | 4 | R | 2 | Float-Big Endian | 1 | 0–1000.0 μg/m3 | |
| 14/1002 | PM10 one minute average measurement | 4 | R | 2 | Float-Big Endian | 1 | 0–1000.0 μg/m3 | |
| 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 | CO2 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/m3 | |
| 24/1100 | PM2.5 24-hour moving average measurement | 4 | R | 2 | Float-Big Endian | 1 | 0–1000.0 μg/m3 | |
| 26/1102 | PM10 24-hour moving average measurement | 4 | R | 2 | Float-Big Endian | 1 | 0–1000.0 μg/m3 | |
| 32/1108 | CO2 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/m3 | |
| 1300 | Primary pollutant 24- hour average measuring value (One of PM2.5/PM10/CO2/ 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/CO2/ TVOC) (Calculated based on 24-hour or 1-hour moving average measurement) | 4 | R | 1 | INT16 | 1-PM25, 2-PM10, 3-CO2; 4-TVOC | ||
| 1303 | Index level of the primary pollutant (One of PM2.5/PM10/CO2/ 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 | ||
| 1304 | AQI value of the primary pollutant) (One of PM2.5/PM10/CO2/ TVOC) (Calculated based on 24-hour or 1-hour moving average measurement) | 4 | R | 1 | INT16 | 0–500 | ||
| 1320 | PM2.5 AQI value (Calculated based on 24-hour moving average measurement) | 4 | R | 1 | INT16 | 0–500 | ||
| 1321 | PM10 AQI value (Calculated based on 24-hour moving average measurement) | 4 | R | 1 | INT16 | 0–500 | ||
| 1322 | CO2 AQI value (Calculated based on 24-hour moving average measurement) | 4 | R | 1 | INT16 | 0–500 | ||
| 1323 | TVOC AQI value (Calculated based on 24-hour moving average measurement) | 4 | R | 1 | INT16 | 0–500 | ||
| 1350 | PM2.5 Pollution index level (Calculated based on 24-hour moving average measurement) | 4 | R | 1 | INT16 | 1–6 | ||
| 1351 | PM10 Pollution index level (Calculated based on 24-hour moving average measurement) | 4 | R | 1 | INT16 | 1–6 | ||
| 1352 | CO2 Pollution index level (Calculated based on 24-hour moving average measurement) | 4 | R | 1 | INT16 | 1–6 | ||
| 1353 | TVOC Pollution index level (Calculated based on 24-hour moving average measurement) | 4 | R | 1 | INT16 | 1–6 | ||
| 78 | 3 color LED status | 4 | R | 1 | INT16 | 0-OFF, 1-Green, 2-Yellow, 3-Red | ||
| 0 | Modbus Address | 3/6 | R/W | 1 | UINT16 | 1–247 | 1 | |
| 1 | Modbus rate (bps) | 3/6 | R/W | 1 | UINT16 | 1-4800, 2-9600, 3-14400, 4-19200, 5-38400, 6-56000, 7-57600, 8-115200 | 2 | |
| 2 | Modbus Parity check bit | 3/6 | R/W | 1 | UINT16 | 1- NONE, 1STOP_BIT, 2- NONE, 2STOP_BIT, 3- Odd, 1STOP_BIT, 4- Even, 1STOP_BIT | 1 | |
| 4 | Temperature correction value | 3/16 | R/W | 2 | Float-Big Endian | 2 | -3.0–3.0 °C/ -6.0–6.0 °F | -2.0 |
| 6 | Humidity correction value | 3/16 | R/W | 2 | Float-Big Endian | 2 | -5.0–5.0%RH | 0 |
| 14 | CO2 compensation value | 3/16 | R/W | 2 | Float-Big Endian | 0 | -300.0–300.0 ppm | 0 |
In order to reserve the decimal part, the measuring value with decimal will be magnified 10/100/1000 times, marked as x10/x100/x1000.
| Starting Register Decimal | Data Description | Function | Read/ Write | Quantity of Registers (2Bytes/16bit) | Format | Decimals | Data Range, Data Description | Default |
| 50/1175 | PM2.5 hourly average measurement x10 | 4 | R | 1 | UINT16 | 1 | 0–10000 corresponding to 0–1000.0 μg/m3 | |
| 51/1176 | PM10 hourly average measurement x10 | 4 | R | 1 | UINT16 | 1 | 0–10000 corresponding to 0–1000.0 μg/m3 | |
| 54/1179 | CO2 hourly average measurement x1 | 4 | R | 1 | UINT16 | 0 | 0–5000 corresponding to 0–5,000 ppm | |
| 55/1180 | TVOC hourly average measurement x1000 | 4 | R | 1 | UINT16 | 3 | 0–3575 corresponding to –4.000 mg/m3 | |
| 56/1150 | PM2.5 one minute average measurement x10 | 4 | R | 1 | UINT16 | 1 | 0–10000 corresponding to 0~1000.0 μg/m3 | |
| 57/1151 | PM10 one minute average measurement x10 | 4 | R | 1 | UINT16 | 1 | 0–10000 corresponding to 0–1000.0 μg/m3 | |
| 58/1152 | Temperature real-time measurement x100 | 4 | R | 1 | INT16 | 2 | -2000–6000 corresponding to -20.00 °C–60.00 °C | |
| 59/1153 | Humidity real-time measurement x100 | 4 | R | 1 | UINT16 | 2 | 0–10000 corresponding to 0–100.00% RH | |
| 60/1154 | CO2 real-time measurement x1 | 4 | R | 1 | UINT16 | 0 | 0–5000 corresponding to 0–5,000 ppm | |
| 61/1155 | TVOC real-time measurement x1000 | 4 | R | 1 | UINT16 | 3 | 0–3575 corresponding to –4.000 mg/m3 | |
| 62/1200 | PM2.5 24-hour moving average measurement x10 | 4 | R | 1 | UINT16 | 1 | 0–10000 corresponding to 0–1000.0 μg/m3 | |
| 63/1201 | PM10 24-hour moving average measurement x10 | 4 | R | 1 | UINT16 | 1 | 0–10000 corresponding to 0–1000.0 μg/m3 | |
| 66/1204 | CO2 24-hour moving average measurement x1 | 4 | R | 1 | UINT16 | 0 | 0–5000 corresponding to 0–5,000 ppm | |
| 67/1205 | TVOC 24-hour moving average measurement x1000 | 4 | R | 1 | UINT16 | 3 | 0–3575 corresponding to 0–4.000 mg/m3 |
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