Debug interface exposes on a three pins header, a 3V3 serial interface (RXD/GND/TXD) for debug purpose.
On DEBUG_TX pin, you will see a lot of messages that Carberry firmware writes to allow users to understand what is happening.

The DEBUG_RX pin is used to send to Carberry ASCII commands, as from Raspberry Pi UART.

1. The setup of the debug UART is fixed to 115200 8 N 1.
2. Commands can be sent in parallel (from Raspberry Pi and from debug port).
3. ECHO control is indipendent on each terminal.
4. Debug terminal works also in low power, with ignition off.