UART Telemetry Output

Details on the UART telemetry output on the HV Pro ESC

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.

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

Reading Datastream

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.

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.

6KB

telemetryRead_Example_v2.c

Open

UART Read Example C Version 2.0

4KB

telemetryRead_Example_v2.txt

Open

UART Read Example Python Version 2.0

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.

5KB

telemetryRead_Example.c

Open

UART Read Example C Version 1.3

3KB

telemetryRead_Example.txt

Open

UART Read Example Python Version 1.3