AS COM ports are disappearing form computers – especially from laptops, there are more and more USB to RS232(COM) adapters showing up in the Internet. The bigger choice the better to end user – he can look and build the best solution that fits his needs. This particular adapter was developed by Alex Sidorenko and its main purpose was to comply RS232 to USB of car ODB(On-Board Diagnostic) unit.

Adapter is equipped with 9 pin D type female connector to match most OBD2 cables available commercially. Adapter doesn’t require any special drives as it uses standard Communication Device Class(CDC). Just download CDC driver plug the adapter and this way create a virtual com port. The layout in Gerber format available for download here. The adapter schematic is really simple and easy to trace on single sided board and don’t forget to flash firmware . Too lazy to build one? - author can sell the blank PCB of adapter and preprogrammed chips by request.