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ABOUT

IAQ Monitor is an advanced, configurable, RS-485 connected device for commercial buildings. It monitors CO2, PM2.5/PM10, TVOC, temperature and humidity. This device provides a Modbus RTU (RS-485) interface, easily integrating with the building automation system.

INITIAL SETUP

The device will power on after voltage is connected.

NOTE: Upon first use (or re-use after a long time shelving) device should be powered continuously for more than 48 hours to ensure stable output of all measured values.

LIGHT RING INDICATOR

There is a circle ring indicator lighting the center of the housing. This light is used to show the measured air quality.

This light indicates the one minute average value of PM2.5, and changes color depending on concentration.

The indicator light behavior can be configured according to DIP switches:

Table 1. DIP Switch Settings.

Indicator SettingDIP4DIP3DIP2DIP1
Light OFFOFFOFFOFFOFF
Three-colorOFFONONONDefault
Green Normally ONONOFFOFFOFF

When the three-color option is selected, indicator color corresponds to the following measured ranges:
— Green <35 μg/m3
— Yellow 35—75 μg/m3
— Red >75 μg/m3

Communication Settings

Wired communication (Modbus RTU) is available for the device. The wiring terminals are shown below. For detailed wiring and installation, please refer to the User Guide.

SPECIFICATIONS

Part Number: C7355A1050
Detection Parameters: PM2.5/PM10, CO2, TVOC, temperature and relative humidity (RH).
Operating Environment:
Temperature: 32 to 122 °F (0 to 50 °C)
Humidity: 0—90% RH
Storage Conditions:
Temperature: 14 to 122 °F (-10 to 50 °C);
Humidity: 0–90% RH (Non-condensing)
Overall Dimensions: 5.12 in. × 5.12 in. × 1.77 in. 130 mm × 130 mm × 45 mm
Net weight: 0.66 lb (300 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 2. Modbus Register Table.

Starting Register DecimalData DescriptionFunctionRead/ WriteQuantity of Registers (2Bytes/16bit)FormatDecimalsData Range, Data DescriptionDefault
0/1050PM2.5 hourly average measurement4R2Float-Big Endian10–1000.0 μg/m3 
2/1052PM10 hourly average measurement4R2Float-Big Endian10–1000.0 μg/m3 
8/1058CO2 hourly average measurement4R2Float-Big Endian00–5,000 ppm 
10/1060TVOC hourly average measurement4R2Float-Big Endian30–4000 mg/m3 
12/1000PM2.5 one minute average measurement4R2Float-Big Endian10–1000.0 μg/m3 
14/1002PM10 one minute average measurement4R2Float-Big Endian10–1000.0 μg/m3 
16/1004Temperature real-time measurement4R2Float-Big Endian2-20.00 °C–60.00 °C 
18/1006Humidity real-time measurement4R2Float-Big Endian20–100.00% RH 
20/1008CO2 real-time measurement4R2Float-Big Endian00–5,000 ppm 
22/1010TVOC real-time measurement4R2Float-Big Endian30–4000 mg/m3 
24/1100PM2.5 24-hour moving average measurement4R2Float-Big Endian10–1000.0 μg/m3 
26/1102PM10 24-hour moving average measurement4R2Float-Big Endian10–1000.0 μg/m3 
32/1108CO2 24-hour moving average measurement4R2Float-Big Endian00–5,000 ppm 
34/1110TVOC 8-hour moving average measurement4R2Float-Big Endian30–4000 mg/m3 
1300Primary pollutant 24- hour average measuring value (One of PM2.5/PM10/CO2/ TVOC) (Calculated based on 24-hour or 1-hour moving average measurement)4R2Float-Big Endian 1300 
1302Primary pollutant type (One of PM2.5/PM10/CO2/ TVOC) (Calculated based on 24-hour or 1-hour moving average measurement)4R1INT16 1-PM25, 2-PM10,3-CO2; 4-TVOC 
1303Index level of the primary pollutant (One of PM2.5/PM10/CO2/ TVOC) (Calculated based on 24-hour or 1-hour moving average measurement)4R1INT16 Level 1-Excellent Level 3-Light pollutionLevel4-Medium pollutionLevel 5-Heavy pollution Level 6-Severe pollution 
 
1304AQI value of the primary pollutant) (One of PM2.5/PM10/CO2/ TVOC) (Calculated based on 24-hour or 1-hour moving average measurement)4R1INT16 0–500 
1320PM2.5 AQI value (Calculated based on 24-hour moving average measurement)4R1INT16 0–500 
1321PM10 AQI value (Calculated based on 24-hour moving average measurement)4R1INT16 0–500 
1322CO2 AQI value (Calculated based on 24-hour moving average measurement)4R1INT16 0–500 
1323TVOC AQI value (Calculated based on 24-hour moving average measurement)4R1INT16 0–500 
 
1350PM2.5 Pollution index level (Calculated based on 24-hour moving average measurement)4R1INT16 1–6 
1351PM10 Pollution index level (Calculated based on 24-hour moving average measurement)4R1INT16 1–6 
1352CO2 Pollution index level (Calculated based on 24-hour moving average measurement)4R1INT16 1–6 
1353TVOC Pollution index level (Calculated based on 24-hour moving average measurement)4R1INT16 1–6 
783 color LED status4R1INT16 0-OFF, 1-Green,
2-Yellow, 3-Red
 
0Modbus Address3/6R/W1UINT16 1–2471
1Modbus rate (bps)3/6R/W1UINT16 1-4800, 2-9600,
3-14400, 4-19200,
5-38400, 6-56000,
7-57600, 8-115200
2
2Modbus Parity check bit3/6R/W1UINT16 1- NONE, 1STOP_BIT, 2- NONE, 2STOP_BIT, 3-Odd, 1STOP_BIT,4-Even, 1STOP_BIT1
4Temperature correction value3/16R/W2Float-Big Endian2-3.0–3.0 °C/-6.0–6.0 °F-2.0
6Humidity correction value3/16R/W2Float-Big Endian2-5.0–5.0%RH0
14CO2 compensation value3/16R/W2Float-Big Endian0-300.0–300.0 ppm0

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 DecimalData DescriptionFunctionRead/ WriteQuantity of Registers (2Bytes/16bit)FormatDecimalsData Range, Data DescriptionDefault
50/1175PM2.5 hourly average measurement x104R1UINT1610–10000
corresponding to 0–1000.0 μg/m3
 
51/1176PM10 hourly average measurement x104R1UINT1610–10000
corresponding to 0–1000.0 μg/m3
 
54/1179CO2 hourly average measurement x14R1UINT1600–5000
corresponding to 0–5,000 ppm
 
55/1180TVOC hourly average measurement x10004R1UINT1630–3575
corresponding to –4.000 mg/m3
 
56/1150PM2.5 one minute average measurement x104R1UINT1610–10000
corresponding to 0~1000.0 μg/m3
 
57/1151PM10 one minute average measurement x104R1UINT1610–10000
corresponding to 0–1000.0 μg/m3
 
58/1152Temperature real-time measurement x1004R1INT162-2000–6000
corresponding to -20.00 °C–60.00 °C
 
59/1153Humidity real-time measurement x1004R1UINT1620–10000
corresponding to 0–100.00% RH
 
60/1154CO2 real-time measurement x14R1UINT1600–5000
corresponding to 0–5,000 ppm
 
61/1155TVOC real-time measurement x10004R1UINT1630–3575
corresponding to –4.000 mg/m3
 
62/1200PM2.5 24-hour moving average measurement x104R1UINT1610–10000
corresponding to 0–1000.0 μg/m3
 
63/1201PM10 24-hour moving average measurement x104R1UINT1610–10000
corresponding to 0–1000.0 μg/m3
 
66/1204CO2 24-hour moving average measurement x14R1UINT1600–5000
corresponding to 0–5,000 ppm
 
67/1205TVOC 24-hour moving average measurement x10004R1UINT1630–3575
corresponding to 0–4.000 mg/m3
 

Honeywell Building Technologies
In the U.S.:
Honeywell
715 Peachtree Street NE
Atlanta, GA 30308
customer.honeywell.com
buildingcontrols.honeywell.com

® U.S. Registered Trademark
©2020 Honeywell International Inc-

Documents / Resources

Honeywell C7355A Room IAQ Monitor [pdf] User Guide
C7355A, Room IAQ Monitor, C7355A Room IAQ Monitor, IAQ Monitor, Monitor
Honeywell C7355A Room IAQ Monitor [pdf] Instruction Manual
C7355A, Room IAQ Monitor, C7355A Room IAQ Monitor

References

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