On 31/7/25 07:59, mick.crane wrote:
For the Pi and most SBC devices they are talking about a TTL level signal that is transmitted in some pins on one of the headers. The data format is the same as serial RS-232 but at 5V or 3V and a few signals are supported - Tx, Tx, Gnd, VCC (to power the card)I've never really known what a serial console is. Say in relation to a Raspberry Pi or Arduino I assumed a serial console was a device with a screen and keyboard.When people talk about a serial console they are talking about connecting a Debian PC to a device with a parallel, wired cable to a parallel port or an adaptor on a PC and emulating this console thing with software?Like a telnet connection? mick
The card I have also has pins for DTR# RTS# RI# DSR# DCD# CTS# that you could connect to spare output pins on the Pi to emulate an old style modem.
You need to buy a cheap (like $5) card that takes the TTL level signal and converts it to serial USB. You plug the USB into a suitable host.