pic - A simple on-circuit RS-232 to USB converter - Electrical Engineering Stack Exchange
USB to RS232 converter
Usb 2.0 To Rs232 Serial Cable Ultra Short Ftdi Chip Com Port Usb To Rs232 Converter Adapter Usb-a To Db9 Male For Windows Macs - Pc Hardware Cables & Adapters - AliExpress
DIY USB to TTL serial adapter – rdist
USB/Serial Converter [FT232RL] : ID 18 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
DIY Wireless Serial Adapter Speaks (True) RS-232 | Hackaday
USB to RS232 Adapter with FT232
SHA - - - Raspberry Pi - RS232 Serial Interface Options (Revisit)
MOD-USB-RS232 - Open Source Hardware Board
Build Your Own USB To Serial Dongle | Hackaday
USB to RS232 Converter Circuit FT232AM MAX3245 – Electronics Projects Circuits
OpenWrt Wiki] Serial Cables
CH3330N - Small and Cheap USB-Serial Converter IC Needs No Crystal - Electronics-Lab.com