USB to Serial communication is now as common as the USB interface working well with RS-232, RS-422, and RS485. USB to serial application styles take many forms from PCI cards to rack mountable or DIN Rail mount devices. Throughout the USB to serial adapter category you will find serial adapters using FTDI and Prolific chip sets. Coogear serial adapters are manufactured with DB9 connectors in single, dual port, and multi port configurations. Available in plastic and industrial-grade metal chassis, all with excellent quality from Coolgear.