Learn how to handle the three types of issues commonly encountered with these adapters.
2-Port USB to RS-232 Serial Adapter Cable
Guide to Selecting a USB to Serial Adapter
USB to RS232 DB9/DB25 Serial Adapter - Serial Cards & Adapters
Green-utech 16FT USB RS-232 to DB25 Serial Adapter
Insignia™ 1.3' USB-to-RS-232 (DB9) PDA/Serial Adapter Cable, with
USB 2.0 to Serial RS232 Cable
USB to Optical Adapter Industrial Isolated RS-232/422/485 - Coolgear
USB to Serial RS232 Cable
Serial to USB Adaptor (RS232)
arduino - Problems with homemade RS232-to-TTL converter board