On Thu, 2022-08-18 at 16:48 +0200, Rainer Dorsch wrote: [...] > I am wondering if ready-made usb-to-usb solutions exist, which contain the > conversion to serial and back to usb internally
I just googled 'usb null modem cable' and got this: https://ftdichip.com/products/usb-nmc-2-5m/ which is available from lots of electronics suppliers, e.g. https://www.digikey.de/de/products/detail/ftdi-future-technology-devices-international-ltd/USB-NMC-2-5M/2441364 -- Tixy