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Current and energy meter

EMU Professional II LoRa LoRaWAN decoder and payload format

The EMU Professional II LoRa is a LoRaWAN current and energy meter that reports energy, power, voltage and current. It is rated IP51 and it works from -25 to 70 °C.

EMU Professional II LoRa
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)

B4 D7 7B 61 01 B4 D7 7B 61 03 12 07 00 00 04 80 00 00 00 05 7D 04 00 00 06 82 45 00 00 07 48 07 00 00 08 28 0A 00 00 09 52 01 00 00 0A BD 25 00 00 E4

Decoded (JSON)

{
  "timestamp": {
    "unit": "seconds",
    "value": 1635506100
  },
  "ActiveEnergyImportT1": {
    "unit": "Wh",
    "value": 1810
  },
  "ActiveEnergyImportT2": {
    "unit": "Wh",
    "value": 128
  },
  "ActiveEnergyExportT1": {
    "unit": "Wh",
    "value": 1149
  },
  "ActiveEnergyExportT2": {
    "unit": "Wh",
    "value": 17794
  },
  "ReactiveEnergyImportT1": {
    "unit": "varh",
    "value": 1864
  },
  "ReactiveEnergyImportT2": {
    "unit": "varh",
    "value": 2600
  },
  "ReactiveEnergyExportT1": {
    "unit": "varh",
    "value": 338
  },
  "ReactiveEnergyExportT2": {
    "unit": "varh",
    "value": 9661
  },
  "timeStamp": 1635506100,
  "medium": {
    "type": 1,
    "desc": "Electricity"
  }
}
FieldValue
timestamp1635506100 seconds
ActiveEnergyImportT11810 Wh
ActiveEnergyImportT2128 Wh
ActiveEnergyExportT11149 Wh
ActiveEnergyExportT217794 Wh
ReactiveEnergyImportT11864 varh
ReactiveEnergyImportT22600 varh
ReactiveEnergyExportT1338 varh
ReactiveEnergyExportT29661 varh
timeStamp1635506100
medium.type1
medium.descElectricity

Example 2 · fPort 100

Payload (hex)

30 D1 05 62 F1 26 01 06 22 F7 01 F3 05 00 F4 05 00 F5 64 00 F6 64 00 F8 02 00 02 02 C4

Decoded (JSON)

{
  "serial-number": {
    "value": "22060126"
  },
  "meter-typ": {
    "value": 1
  },
  "current-transformerprimary": {
    "value": 5
  },
  "current-transformersecondary": {
    "value": 5
  },
  "voltage-transformerprimary": {
    "value": 100
  },
  "voltage-transformersecondary": {
    "value": 100
  },
  "MIDyear": {
    "value": "2022"
  },
  "timeStamp": 1644548400,
  "medium": {
    "type": 1,
    "desc": "Electricity"
  }
}
FieldValue
serial-number.value22060126
meter-typ.value1
current-transformerprimary.value5
current-transformersecondary.value5
voltage-transformerprimary.value100
voltage-transformersecondary.value100
MIDyear.value2022
timeStamp1644548400
medium.type1
medium.descElectricity

Specifications

Manufacturer
EMU
Model
Professional II LoRa
Type
Current and energy meter
Measures
energy, power, voltage, current
Protection
IP51
Operating temperature
-25 … 70 °C
LoRaWAN regions
EU863-870

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 EMU Professional II LoRa 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.