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Indoor air quality sensor

MCCI Model 4841 LoRaWAN decoder and payload format

The MCCI Model 4841 is a LoRaWAN indoor air quality sensor that reports temperature, humidity, dust particles, TVOC and barometric pressure. It runs on a replaceable LiPo 3.7V battery and it works from -20 to 70 °C.

MCCI Model 4841
Official decoderProduct page

Payload format

An uplink from the device as it arrives at the network server, and what the official decoder returns for it. Examples come from the decoder's own test cases.

Example 1 · fPort 1

Payload (hex)

20 FF 20 00 34 CD 4E 66 2A 1E 00 63 54 99 99 6C 80 7C 80 89 60 9F A0 AF A0 BB B8 BF A0 C9 C4 CB B8 56 78

Decoded (JSON)

{
  "port": 1,
  "format": 32,
  "tvoc": 22136,
  "aqi": 251,
  "aqi_partial": {
    "10": 174,
    "1.0": 174,
    "2.5": 251
  },
  "boot": 42,
  "dust": {
    "5": 5000,
    "10": 6000,
    "0.3": 1000,
    "0.5": 2000,
    "1.0": 3000,
    "2.5": 4000
  },
  "p": 1017.12,
  "pm": {
    "10": 300,
    "1.0": 100,
    "2.5": 200
  },
  "rh": 60,
  "tDew": 21.390006900020513,
  "tHeatIndex": 32.83203227777776,
  "t": 30,
  "vbat": 2,
  "vbus": 4.89990234375,
  "vsys": 3.300048828125
}
FieldValue
port1
format32
tvoc22136
aqi251
aqi_partial.10174
aqi_partial.1.0174
aqi_partial.2.5251
boot42
dust.55000
dust.106000
dust.0.31000
dust.0.52000
dust.1.03000
dust.2.54000
p1017.12
pm.10300
pm.1.0100
pm.2.5200
rh60
tDew21.390006900020513
tHeatIndex32.83203227777776
t30
vbat2
vbus4.89990234375
vsys3.300048828125

Example 2 · fPort 5

Payload (hex)

20 7F 20 00 34 CD 4E 66 2A 1E 00 63 54 99 99 56 78 6C 80 7C 80 89 60 9F A0 AF A0 BB B8 BF A0 C9 C4 CB B8

Decoded (JSON)

{
  "port": 5,
  "format": 32,
  "tvoc": 22136,
  "aqi": 251,
  "aqi_partial": {
    "10": 174,
    "1.0": 174,
    "2.5": 251
  },
  "boot": 42,
  "dust": {
    "5": 5000,
    "10": 6000,
    "0.3": 1000,
    "0.5": 2000,
    "1.0": 3000,
    "2.5": 4000
  },
  "p": 1017.12,
  "pm": {
    "10": 300,
    "1.0": 100,
    "2.5": 200
  },
  "rh": 60,
  "tDew": 21.390006900020513,
  "tHeatIndex": 32.83203227777776,
  "t": 30,
  "vbat": 2,
  "vbus": 4.89990234375,
  "vsys": 3.300048828125
}
FieldValue
port5
format32
tvoc22136
aqi251
aqi_partial.10174
aqi_partial.1.0174
aqi_partial.2.5251
boot42
dust.55000
dust.106000
dust.0.31000
dust.0.52000
dust.1.03000
dust.2.54000
p1017.12
pm.10300
pm.1.0100
pm.2.5200
rh60
tDew21.390006900020513
tHeatIndex32.83203227777776
t30
vbat2
vbus4.89990234375
vsys3.300048828125

Specifications

Manufacturer
MCCI
Model
Model 4841
Type
Indoor air quality sensor
Measures
temperature, humidity, dust particles, TVOC, barometric pressure
Battery
LiPo 3.7V (replaceable)
Operating temperature
-20 … 70 °C
LoRaWAN regions
EU863-870, US902-928, AU915-928, AS923, KR920-923, IN865-867

Connect it to Cloud Studio IoT

  1. 1

    Register the device in your network server

    Add it to The Things Stack, ChirpStack, Actility ThingPark or LORIOT with its DevEUI, JoinEUI and AppKey and the frequency plan of your region.

  2. 2

    Apply the decoder

    In The Things Stack, pick the model from the device repository and its decoder is applied for you. In ChirpStack v4, paste the official decoder as the device profile's JavaScript codec.

  3. 3

    Connect the network server to Cloud Studio IoT

    Set up the integration once per network server; every device registered there then reaches Cloud Studio IoT with its decoded values.

  4. 4

    Build dashboards and alarms

    The decoded fields become device variables for dashboards, alarms by email or SMS, and scheduled reports.

See your MCCI Model 4841 on a dashboard

Start a free trial, add the device with its DevEUI and get dashboards and alarms from its next uplink.

Talk to us

Frequently asked questions

Device facts and decoder examples: The Things Network Device Repository (Apache-2.0) · commit 7693223, imported 2026-10-05.