Honeywell C7355A Room IAQ Monitor
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 Setting |
DIP4 |
DIP3 | DIP2 | DIP1 | |
| Light OFF |
OFF |
OFF | OFF | OFF | |
| Three-color |
OFF |
ON | ON | ON |
Default |
| Green Normally ON |
ON |
OFF | OFF | OFF |
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: C7355A1050Detection 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% RHStorage 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 mmNet weight: 0.66 lb (300 g)Certification Standard: CE/FCC
Modbus Register Table
Mode: RTU (MSB First)Baud Rate:1-48002-96003-144004-192005-384006-560007-576008-115200default: 2-9600bpsStart Bits: 1Data Bits: 8Stop Bits: 1 / 2default: 1Parity: None / Odd / Evendefault: None
Register MapSupport Function code:3 – Read Holding Registers4 – Read Input Registers6 – Write Single Register16 – Write Multiple registers
Table 2. 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 | 0–10000corresponding to 0–1000.0 μg/m3 | |
| 51/1176 | PM10 hourly average measurement x10 | 4 | R | 1 | UINT16 | 1 | 0–10000corresponding to 0–1000.0 μg/m3 | |
| 54/1179 | CO2 hourly average measurement x1 | 4 | R | 1 | UINT16 | 0 | 0–5000corresponding to 0–5,000 ppm | |
| 55/1180 | TVOC hourly average measurement x1000 | 4 | R | 1 | UINT16 | 3 | 0–3575corresponding to –4.000 mg/m3 | |
| 56/1150 | PM2.5 one minute average measurement x10 | 4 | R | 1 | UINT16 | 1 | 0–10000corresponding to 0~1000.0 μg/m3 | |
| 57/1151 | PM10 one minute average measurement x10 | 4 | R | 1 | UINT16 | 1 | 0–10000corresponding to 0–1000.0 μg/m3 | |
| 58/1152 | Temperature real-time measurement x100 | 4 | R | 1 | INT16 | 2 | -2000–6000corresponding to -20.00 °C–60.00 °C | |
| 59/1153 | Humidity real-time measurement x100 | 4 | R | 1 | UINT16 | 2 | 0–10000corresponding to 0–100.00% RH | |
| 60/1154 | CO2 real-time measurement x1 | 4 | R | 1 | UINT16 | 0 | 0–5000corresponding to 0–5,000 ppm | |
| 61/1155 | TVOC real-time measurement x1000 | 4 | R | 1 | UINT16 | 3 | 0–3575corresponding to –4.000 mg/m3 | |
| 62/1200 | PM2.5 24-hour moving average measurement x10 | 4 | R | 1 | UINT16 | 1 | 0–10000corresponding to 0–1000.0 μg/m3 | |
| 63/1201 | PM10 24-hour moving average measurement x10 | 4 | R | 1 | UINT16 | 1 | 0–10000corresponding to 0–1000.0 μg/m3 | |
| 66/1204 | CO2 24-hour moving average measurement x1 | 4 | R | 1 | UINT16 | 0 | 0–5000corresponding to 0–5,000 ppm | |
| 67/1205 | TVOC 24-hour moving average measurement x1000 | 4 | R | 1 | UINT16 | 3 | 0–3575corresponding to 0–4.000 mg/m3 |
Honeywell Building TechnologiesIn the U.S.:Honeywell715 Peachtree Street NEAtlanta, GA 30308customer.honeywell.combuildingcontrols.honeywell.com
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References
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