Add an RS232 Serial Port with Circuit Isolation to your Laptop or Desktop Computer, through USB. The ICUSB2321FIS 1-Port ftDI USB to Serial RS232 Adaptor Cable with Optical Isolation converts an available USB 1.1 or 2.0 port into an RS232 DB9 port that can be used to connect, monitor and control your serial devices.The USB to serial Adaptor features integrated optical isolation circuits and surge protection to protect your critical, sensitive control equipment against electrical damage, making it a viable solution for costly industrial serial devices.The versatile ftDI chipset also supports COM retention, additional customization/features, and compatibility not offered by most other solutions. Broad operating system compatibility including Windows, Windows CE, Mac OS and Linux, makes this product easy to integrate into mixed environments.Backed by a StarTech.com 2-year warranty and free lifetime technical support. Circuit isolation provides electrical protection for sensitive, and often expensive industrial equipment Portable USB-Powered design requires no bulky power Adaptor or outlet. The ftDI chipset driver is highly customizable and broadly compatible, making it the ideal solution for any setup. Perfect for IT Administrators looking to add legacy functionality to newer laptops, desktop computers and servers that lack an integrated RS232 port. Connect, monitor and control industrial/automotive sensors and other sensitive equipment. Connect bar code scanners, receipt printers and other point-of-sale devices. Connect and program LED and Digital signage boards with serial communication ports. Connect a satellite receiver, serial modem, or PDU.