USB 2.0 Quad Serial Convertors. The USB2-SERIALQUAD is a USB to Serial RS-232 Cable provides 4 RS-232 Serial (DB-9 male) connectors via one standard USB port. You can instantly enjoy connectivity with more→your Modem PDA POS or other serial devices on your PC or Mac without the hassle of opening your computer case. It provides a quick simple and cost-effective solution and is ideal for various communication and automation applications.SpecificationCompatible with USB Specification v1.1 and v2.0 (Full-Speed)Supports 2/4 port Serial ports at the same time.Supports all common RS-232 Serial Port.Automatic USB Protocol handling.Supports remote wake-up and power management.USB bus powered no external