pySerial API — pySerial 3.4 documentation
https://pyserial.readthedocs.io/en/latest/pyserial_api.htmlThe port is immediately opened on object creation, when a port is given. It is not opened when port is None and a successive call to open() is required.. port is a device name: depending on operating system. e.g. /dev/ttyUSB0 on GNU/Linux or COM3 on Windows.. The parameter baudrate can be one of the standard values: 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, …