As you are probably aware, there are no standard USB-DB9 Console adapters. They are all vendor specific. But the cloning industry has created a few semi-standards based on specific chipsets. This is not strictly true. There is a Communications Device Class (CDC ACM) defined by the USB-IF that covers basic serial devices and most OSs (even Windows! Though it does require a .inf file anyway) include a driver for it. A rumour I heard recently was that its lack of popularity was a result of Microsoft and Intel not wanting device developers to ignore the advantages of USB and just use CDC to continue using their
On 2016-02-02 02:02, Bjørn Mork wrote: old-school RS232 protocols for mice or whatever. There are also some good reasons not to use it, such as flow control, strict timing, higher data rates, and added features available with custom chipsets, but it's just fine for a serial console. Exar, Microchip and others make simple and cheap USB-UART chips using CDC ACM, and it's a very common application example for USB microcontrollers. USB console ports are just adding complexity where it offers no advantage. KISS. Keenan