![]() ![]() The USB implementors forum also specified how CDC subclasses should act, including for those devices intended to talk with each other over the public switched telephone network (PSTN). ![]() The USB implementors forum organization has described how devices conforming to the Communications Device Class (CDC) should present themselves to the USB host. Warning: this is a Linux specific post, although it also contains genuine pieces of USB culture. Have you ever wondered why some USB devices used /dev/ttyUSB0 (or 1, or n) and others /dev/ttyACM0 (or 1, or n) when they are plugged into the host computer, while they seem to be acting as UART devices ( RS-232-like) over USB in both cases? Have you wondered why example USB firmwares for microcontrollers always end up with names such as /dev/ttyACM0 and never as /dev/ttyUSB0? ![]()
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February 2023
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