# ABB B2x meter

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<span class="badge testing">TESTING</span> <span class="badge origin-etm">ETM</span> <span class="badge consumer">CONSUMER</span>

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The ABB B2x energy meter communicates over **Modbus RTU** on the hub's RS485
bus. Three-phase measurement (voltages, currents and power per phase).

## 1. Hardware required

- An ABB B2x meter
- A USB↔RS485 adapter on the hub side
- Bus cable, 2 cores (A/B) + ground

## 2. RS485 wiring

A↔A, B↔B, common ground, **120 Ω** at the end of the bus.

## 3. Modbus addressing

A unique slave address on the bus (`1`–`254`, default `1`).

## 4. Adding in PowerSync

Added by **automatic discovery** or **manually** (entering the slave address).
See [Adding a device](../../installation/application.md).

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## Reference

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**Manufacturer:** ABB  
**Plugin:** `AbbB2x`

#### Supported models
| Model | Role | Transport | Pairing | Quantities |
| --- | --- | --- | --- | --- |
| **ABB B2x energy meter** | Energy meter | Modbus RTU | Auto-discovery / Manual | 14 |

#### Per-model detail
??? abstract "ABB B2x energy meter — `abbB2x`"
    _Discovery parameters:_

    | Key | Label | Type | Range | Default |
    | --- | --- | --- | --- | --- |
    | `slaveAddress` | Modbus slave address | uint | 1–254 | `1` |

    _Settings:_

    | Key | Label | Type | Range | Default | Read-only |
    | --- | --- | --- | --- | --- | --- |
    | `slaveAddress` | Modbus slave address | uint | 1–254 | `1` | yes |
    | `modbusMasterUuid` | Modbus RTU master | QString | — | — | yes |

    _Measured quantities:_

    | Key | Quantity | Type | Unit |
    | --- | --- | --- | --- |
    | `connected` | Connected | bool | — |
    | `currentPower` | Current power | double | Watt |
    | `totalEnergyConsumed` | Total energy consumed | double | KiloWattHour |
    | `totalEnergyProduced` | Total energy produced | double | KiloWattHour |
    | `frequency` | Frequency | double | Hertz |
    | `voltagePhaseA` | Voltage phase A | double | Volt |
    | `voltagePhaseB` | Voltage phase B | double | Volt |
    | `voltagePhaseC` | Voltage phase C | double | Volt |
    | `currentPhaseA` | Current phase A | double | Ampere |
    | `currentPhaseB` | Current phase B | double | Ampere |
    | `currentPhaseC` | Current phase C | double | Ampere |
    | `currentPowerPhaseA` | Current power phase A | double | Watt |
    | `currentPowerPhaseB` | Current power phase B | double | Watt |
    | `currentPowerPhaseC` | Current power phase C | double | Watt |

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