You need a communications protocol But isn’t RS-232 our communications protocol? Well, it is the communications transport layer. If you read through the code you will see I set the baud rate to 9600 using a data/character protocol of 8 data bits No parity bits and 1 stop bits commonly labeled as 8-N-1. So isn’t our protocol 8-N-1? No. That is the data transmission protocol for the transport layer it is not a communications protocol. … Raspberry Qt – Part 10Read more