Honeywell C7355B In-Duct IAQ Monitor User Guide

: June 6, 2024
: Honeywell

Table of Contents

ABOUT
INITIAL SETUP
LIGHT INDICATION
COMMUNICATION SETTINGS
SPECIFICATIONS
Modbus Register Table
Documents / Resources

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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Documents / Resources

| Honeywell C7355B In-Duct IAQ Monitor [pdf] User Guide
C7355B, In-Duct IAQ Monitor, C7355B In-Duct IAQ Monitor, IAQ Monitor
---|---
| Honeywell C7355B In-Duct IAQ Monitor [pdf] User Guide
C7355B In-Duct IAQ Monitor, C7355B, In-Duct IAQ Monitor, IAQ Monitor, Monitor
| Honeywell C7355B In-Duct IAQ Monitor [pdf] Instruction Manual
C7355B, In-Duct IAQ Monitor
| Honeywell C7355B In-Duct IAQ Monitor [pdf] User Guide
C7355B, In-Duct IAQ Monitor