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Vibration sensor

TE Connectivity 8931EX LoRaWAN decoder and payload format

The TE Connectivity 8931EX is a LoRaWAN vibration sensor that reports vibration and temperature. It runs on a replaceable LS 1733 battery.

TE Connectivity 8931EX
Official decoder

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)

4C 08 EB 04 0B 00 00 00 09 00 08 00 3F 8D 01 00 00 02 7A 00 00 00 01 E2 00 00 00 00 CE 03 00 00 00 09 2D 00 00 00 0B 39 00 00 00 C2 07 00 00 00

Decoded (JSON)

{
  "bat": "76%",
  "peak_nb": 8,
  "temp": 25.9,
  "sig_rms": 0.011,
  "preset": 0,
  "devstat": {
    "acc": "ok",
    "temp": "ok",
    "rotEn": "disabled",
    "com": "ok",
    "battery": "ok"
  },
  "peaks": [
    {
      "freq": 9,
      "mag": 0.008,
      "ratio": 63
    },
    {
      "freq": 397,
      "mag": 0,
      "ratio": 2
    },
    {
      "freq": 122,
      "mag": 0,
      "ratio": 1
    },
    {
      "freq": 226,
      "mag": 0,
      "ratio": 0
    },
    {
      "freq": 974,
      "mag": 0,
      "ratio": 0
    },
    {
      "freq": 11529,
      "mag": 0,
      "ratio": 0
    },
    {
      "freq": 14603,
      "mag": 0,
      "ratio": 0
    }
  ]
}
FieldValue
bat76%
peak_nb8
temp25.9
sig_rms0.011
preset0
devstat.accok
devstat.tempok
devstat.rotEndisabled
devstat.comok
devstat.batteryok
peaks[{"freq":9,"mag":0.008,"ratio":63},{"freq":397,"mag":0,"ratio":2},{"freq":122,"mag":0,"ratio":1},{"freq":226,"mag":0,"ratio":0},{"freq":974,"mag":0,"ratio":0},{"freq":11529,"mag":0,"ratio":0},{"freq":14603,"mag":0,"ratio":0}]

Specifications

Manufacturer
TE Connectivity
Model
8931EX
Type
Vibration sensor
Measures
vibration, temperature
Battery
LS 1733 (replaceable)
LoRaWAN regions
EU863-870, US902-928

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 TE Connectivity 8931EX 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.