On Thu, Oct 24, 2024 at 09:44:55PM +0100, Joe wrote: > On Thu, 24 Oct 2024 14:10:53 -0400 > "Roy J. Tellason, Sr." <r...@rtellason.com> wrote: > > > On Wednesday 23 October 2024 11:14:52 am Jeffrey Walton wrote:
[...] > The CH340 is a well-known device, and the usbserial module along with > something like cp210x should deal with multiple devices, assigning them > ttyUSBx device numbers. According to the logs posted elsewhere in this thread, that part is already happening. I doubt all that baud rate, stop bits and parity dance we know and love from the RS232s of yore are necessary with TTYUSBs. We are talking to an abstraction layer in the kernel anyway. My hunch is at one protocol layer higher: the device is waiting for a magic word to get things started. Kind of the AT protocol of those modems (again, of yore -- rumour has it, tough, that baseband processors...), which sit there, silent, waiting for an "AT" to which they then respond "OK". Cheers -- t
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