PixRacer Serial Mapping

Many different names are given to the serial hardware on PixRacer where ArduPilot is concerned. This document attempts to supply a mapping between them.

DataSheet

Param Prefix

HW Label

Default Protocol

Notes

SERIAL0

USB

Console

Micro-USB Plug

USART2

SERIAL1

TELEM1

MAVLink

bootloader serial##

USART3

SERIAL2

TELEM2

MAVLink

UART4

SERIAL3

GPS

GPS

USART8

SERIAL4

FRSky

GPS2**

normally inverted

USART1

SERIAL5

ESP-01

MAVLink

UART7

SERIAL6

DEBUG

disabled

Notes:

** While the default here is GPS, the port is inverted so this won’t work with a GPS, it was intended for use with FrSky receivers for telemetry. Usually SERIAL4_PROTOCOL should be set to an FrSky protocol and a diode tied from TX (anode) to RX and attached to the SPort of an FrSky receiver.Alternatively, SERIAL4_OPTIONS can be set to 2, to disable the inverters for normal use.

## can be used for firmware upload instead of USB port, if needed.