# EM330 / EM340 emulation

### Defaults

* Modbus device id: `1`
* RS485: `9600 8N1`
* Function codes: `FC03`
* Data types: mixed `int32` and `int16`
* Unavailable values: `0`

### Main measurement registers

| Register | Description              | Type    | Unit / encoding       |
| -------- | ------------------------ | ------- | --------------------- |
| 0        | voltage\_l1              | `int32` | V x10                 |
| 2        | voltage\_l2              | `int32` | V x10                 |
| 4        | voltage\_l3              | `int32` | V x10                 |
| 6        | line\_voltage\_l1\_l2    | `int32` | V x10                 |
| 8        | line\_voltage\_l2\_l3    | `int32` | V x10                 |
| 10       | line\_voltage\_l3\_l1    | `int32` | V x10                 |
| 12       | current\_l1              | `int32` | A x1000               |
| 14       | current\_l2              | `int32` | A x1000               |
| 16       | current\_l3              | `int32` | A x1000               |
| 18       | active\_power\_l1        | `int32` | W x10                 |
| 20       | active\_power\_l2        | `int32` | W x10                 |
| 22       | active\_power\_l3        | `int32` | W x10                 |
| 24       | mirror of 18             | `int32` | W x10                 |
| 26       | mirror of 20             | `int32` | W x10                 |
| 28       | mirror of 22             | `int32` | W x10                 |
| 30       | reactive\_power\_l1      | `int32` | fixed `0`             |
| 32       | reactive\_power\_l2      | `int32` | fixed `0`             |
| 34       | reactive\_power\_l3      | `int32` | fixed `0`             |
| 36       | system\_voltage\_ln      | `int32` | averaged value        |
| 38       | system\_voltage\_ll      | `int32` | averaged value        |
| 40       | system\_active\_power    | `int32` | W x10                 |
| 42       | system\_apparent\_power  | `int32` | same as register `40` |
| 44       | system\_reactive\_power  | `int32` | fixed `0`             |
| 46       | power\_factor\_l1        | `int16` | `1000` or `-1000`     |
| 47       | power\_factor\_l2        | `int16` | `1000` or `-1000`     |
| 48       | power\_factor\_l3        | `int16` | `1000` or `-1000`     |
| 49       | power\_factor\_total     | `int16` | `1000` or `-1000`     |
| 50       | phase sequence           | `int16` | fixed `0`             |
| 51       | frequency                | `int16` | `500` = 50.0 Hz       |
| 52       | imported energy total    | `int32` | kWh x10               |
| 54       | imported reactive energy | `int32` | fixed `0`             |
| 80       | exported energy total    | `int32` | kWh x10               |
| 82       | exported reactive energy | `int32` | fixed `0`             |
| 92       | run hour meter           | `int32` | seconds since boot    |

### Configuration / info registers

| Register | Description        | Type    | Value                  |
| -------- | ------------------ | ------- | ---------------------- |
| 406      | pre4 meter flag    | `int32` | `0` or `1`             |
| 408      | firmware version   | `int32` | packed `MMmmpp`        |
| 410      | dongle name        | `int32` | packed `P1M3`          |
| `0x2000` | device id          | `int16` | current `DevID`        |
| `0x2001` | baudrate selector  | `int16` | `1-5`                  |
| `0x2002` | parity selector    | `int16` | `1` = none, `2` = even |
| `0x2003` | stop bits          | `int16` | `1` or `2`             |
| `0x2004` | max words per read | `int16` | fixed `50`             |

### Notes

* The implementation mixes 16-bit and 32-bit registers, so clients must request registers exactly as expected by the target integration.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.smart-stuff.nl/p1-modbus-dongle/quick-start/register-mapping/em330-em340-emulation.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.