Diagram of a serial port implemented with a simple USB<->TTL adapter and [YouTube-video](https://youtu.be/NxW2GOw5Mqk) KiCad PCB desing in the hardware folder It works! ... well it "worked"...fine with the first version of the Nabu software, but now something has changed... so this adapter only works with the alternative "monitor" that I tested ... see my YouTube video. ![NABU-Online](https://github.com/Kris-Sekula/NABU/blob/main/RS422Alternative/NABU_online.jpg) Detailed Diagram ![USB-serial-Adapter](https://github.com/Kris-Sekula/NABU/blob/main/RS422Alternative/USB_interface.png) I'm also testing virtual com port using ESP8266 and the esp-link firmware ![esp-link](https://github.com/Kris-Sekula/NABU/blob/main/RS422Alternative/esp-nabu.jpg)