SIIG's DP Quartet Serial 550 PCI is an excellent solution designed to add four additional 9-pin RS232 serial ports for connecting multiple serial-based devices to your PCI-enabled desktop computer. This 4-port serial adapter card comes with four high-speed 16550 UART serial ports supporting data transfer rate of up to 230Kb/s. The serial ports can work as either standard RS232 ports, or can be independently configured as 5V /12V power outputs for devices that require power such as handheld scanners, table scanners, and POS displays. The DP Quartet Serial 550 PCI features IRQ sharing to reduce IRQ conflicts, built-in 32-byte FIFO buffers to dramatically increase data transmit/receive speed especially under Windows multitasking environment, and PME (Power Management Event) that allows device to request a change in system power state (wake up system). It features dual-profile design to work in standard-height and low-profile chassis with the included brackets, and Universal PCI card support to work with 32-/64-bit, 3.3v/5v PCI and PCI-X slot. Industry standards supported by this CyberPro powered serial adapter card include PCI v2.2 universal card standard, PCI-X & 64-bit compatible, RoHS, and FCC Class B (DoC) & CE regulatory approved. Backed by SIIG's limited lifetime warranty and compatible with a wide variety of Windows operating systems, the DP Quartet Serial 550 PCI is the best-value serial adapter card in the market for connecting a wide variety of serial devices.