While standard peripherals have largely migrated to USB, serial ports (COM ports) are often the better choice for specific engineering needs:
How to talk to your microcontroller over serial | Home - jaseg.de Serial Port Complete - Latest Microcontroller p...
Modern serial communication now includes USB Virtual COM Ports , allowing devices to use the simpler serial protocol over a physical USB connection. Key Learning Areas from the Book While standard peripherals have largely migrated to USB,
Schematic diagrams for building converters between RS-232, RS-485, and 5V TTL logic. and 5V TTL logic.