Czech Republic, Switzerland USB to four RS232 / 422/485 serial converter 2204A|usb to lan software|usb adapter rs232usb rs232 serial cable - AliExpress
USB auf Seriell RS232 Adapter/ Konverter - Serielle Karten & Adapter | Schweiz
UC232A | Aten USB to serial RS232 converter | Distrelec Switzerland
IK Multimedia USB-C to Micro USB cable – Thomann Switzerland
USB auf Seriell RS232 Adapter/ Konverter - Serielle Karten & Adapter | Schweiz
3' USB to RS232 DB9 Serial Adapter Cable - Serial Cards & Adapters | Switzerland
pro snake USB-RS232 Adapter 2.0 – Thomann Switzerland
Konverterkabel RS-232 (seriell, D-Sub, 9-polig) auf USB fuer BEG, Grieder Elektronik Bauteile AG