Quatech Serial Adapter Connect serial peripherals and boost speed with 8-port Quatech Serial Adapter. It broaden the range of external peripherals used on your computer. They give your laptop or workstation the ability to communicate between a USB port and up to eight RS-232, RS-422, or RS-485 serial peripherals. USB 2.0 is fully compatible with USB 1.1 devices. Industry-leading compatibility with all major operating systems (and all USB 1.0 systems) make these units truly plug-and-play. Get standard COM ports without software changes and make your order for the 8-port Quatech Serial Adapter right away!