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USB serial adapters are often reviewed with PCI cards in mind. Companies manufacture PCI cards are normally viewed as excellent manufacturers of serial adapters as well. Twin serial adapters with USB compatibility are the best option for those who want a really wide platform for enhancing the use of their computers. In order for a computer to connect with serial devices, there is need for RS-422 ports. The issue of power sourcing is also important. It is better to buy those serial adapters that tap power through a USB connection. In this case, the need for a power adapter does not arise. System requirements are a very important factor when buying serial adapters for corporate use. For instance, all computers must have USB ports for compatibility purposes. Mac OS 8.6 is also needed. Serial adapters are normally targeted only for use with modems, video decks, serial printers, serial PDAs, GPS devices and graphic tablets. They are also used for scientific in instrumentation. You also need to check its compatibility status when it comes to use of AppleTalk or Local Talk. In this case, it means that it does not function with Mac OS X as well. For a detailed guide on how serial adapters operate, manufacturers provide a CD containing driver software as well as a user guide. Sometimes serial adapters are also known as serial converters. The ability of serial converters is to convert USB input into many different formats making it easy to use equipment in an environment of high interactivity and efficiency. If a serial adapter uses the latest version of FTDI chipset, you may have to check on any compatibility problems that may arise. A USB-232-1 serial adapter comes with a port powered connectivity option to a USB. It is a dual-port converter that can be used on any standard port. It is also backward compatible. You can use it in combination with two RS-232C ports.