xiego-g90-headprotocol

Work to reverse engineer the protocol for the Xiegu G90's head unit.

Discussion about this is curerntly taking place here: https://xiegug90.groups.io/g/TechnicalAnalysis/

DB-9 pinout

1. +8V
2. Serial1 - 3.3V 115200 8n1 - From head - Burst of 96 bytes every 29.5 ms
3. Serial2 - 3.3V 115200 8n1 - To head - Burst every 81.3 ms
4. Power button - Idles at 3.3V, goes to when pressed. Shoots to 11V when off.
5. GND
6. phones1 - Signal Output to headhones - switched via a relay between the built-in speaker and headphone jack
7. phones2 - Near 0V
8. IN_R
9. IN_L

RS232 protocol

These are some python scripts to help decode the 3.3V RS-232 packets sent between the head and the base. They use the python Construct library, which you may need to install with something like pip install construct. The head to body protocol is defined in xiegug90head.py.

Base to Head decoding/printing script (log_body.py)

This script decodes some of the bytes from the body to the head. It's a WiP, but decodes some of the flags, the decoded CW text, and the FFT data.

Head to Base decoding/printing script (log_head.py)

I have a python script, log_head.py, that decodes the messages from the detachable head to the unit base. It uses a 3.3V RS-232 adapter, with GND connected, and the head unit's serial output connected to RS-232's adapter's input.

Head to Base control script (generate_head_data.py)

This script generates some packets to show that we can control the body using the same protocol as the head. It even generates correct CRC values!