> For the complete documentation index, see [llms.txt](https://docs.powerdrives.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.powerdrives.net/products/hv_pro/uart-telemetry-output.md).

# UART Telemetry Output

{% hint style="danger" %}
The UART output is not isolated from the signal input connections. The output must be connected to a different device to the signal generator. Failure to do so will result in permanent damage to the unit.
{% endhint %}

## Connections

HV Pro units produced after Feb 2020 will contain a separate header for the UART output stream. If your unit does not contain this header, please contact APD on how to proceed.

### Pinout

![](/files/-MFcUPmCf6J7BMOzHb4m)

## Reading Datastream <a href="#reading-datastream" id="reading-datastream"></a>

The UART output of the ESC matches the logged data contents. The data stream will begin when the ESC receives a valid throttle signal (arming is not necessary). Datarate is **115200** Baud.&#x20;

### Version 2.0 Structure

The UART output packet structure is valid for firmware versions 2.0 and onwards. This firmware is compatible with version 2.0 onwards of the configuration tool.

#### Packet Structure

| Index | Datapoint           | Size                   |
| ----- | ------------------- | ---------------------- |
| 0     | Voltage             | 16bit Unsigned Int     |
| 1     | Temperature         | 16bit Unsigned Int     |
| 2     | Bus Current         | 16bit Int              |
| 3     | Reserved            | 16bit Unsigned Int     |
| 4     | E-RPM               | 32bit Unsigned Int     |
| 5     | Input Duty          | 16bit Unsigned Int     |
| 6     | Motor Duty          | 16bit Unsigned Int     |
| 7     | Status Flags        | 8bit Unsigned Int      |
| 8     | Reserved            | 8bit Unsigned Int      |
| 9     | Checksum (Fletcher) | 16bit Unsigned Int     |
| 10    | Stop Bytes          | 16bit (Value is 65535) |

**Status Flag Structure**

| Bit Position | Status Purpose                                                                                      |
| ------------ | --------------------------------------------------------------------------------------------------- |
| Bit 0        | Motor Started, set when the motor is running as expected.                                           |
| Bit 1        | Motor Saturation Event, set when saturation is detected and power is reduced for desync protection. |
| Bit 2        | ESC Over temperature event occurring, shut down method as per configuration.                        |
| Bit 3        | ESC Overvoltage event occurring, shut down method as per configuration.                             |
| Bit 4        | ESC Undervoltage event occurring, shut down method as per configuration.                            |
| Bit 5        | Startup error detected, motor stall detected upon trying to start.                                  |
| Bit 6-7      | Unused, Reserved.                                                                                   |

#### Reading Examples

Implementation examples of reading the raw data stream, and calculating values from the raw data.

{% file src="/files/-MkKAO8hVpJuXCO-9O57" %}
UART Read Example C Version 2.0
{% endfile %}

{% file src="/files/-MkKAWN4hL-6uUR0ORek" %}
UART Read Example Python Version 2.0
{% endfile %}

### Version 1.0 Structure

The UART output packet structure is valid for firmware versions 1.0 and onwards. This firmware is compatible with version 1.0 onwards of the configuration tool.

#### Packet Structure

| Index | Datapoint           | Size                   |
| ----- | ------------------- | ---------------------- |
| 0     | Voltage             | 16bit Unsigned Int     |
| 1     | Temperature         | 16bit Unsigned Int     |
| 2     | Bus Current         | 16bit Int              |
| 3     | Reserved 0          | 16bit Unsigned Int     |
| 4     | E-RPM               | 32bit Unsigned Int     |
| 5     | Input Duty          | 16bit Unsigned Int     |
| 6     | Motor Duty          | 16bit Unsigned Int     |
| 7     | Reserved 1          | 16bit Unsigned Int     |
| 8     | Checksum (Fletcher) | 16bit Unsigned Int     |
| 9     | Stop Bytes          | 16bit (Value is 65535) |

#### Reading Examples

Implementation examples of reading the raw data stream, and calculating values from the raw data.

{% file src="/files/-MkK9p90o-JsHs9qhP-3" %}
UART Read Example C Version 1.3
{% endfile %}

{% file src="/files/-MkKA0uHuKg-wPw05JfL" %}
UART Read Example Python Version 1.3
{% endfile %}