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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 230 Kbps. The serial ports can work as either standard RS232 ports, or can be independently configured as 5 V/12 V 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). Industry standards supported by this CyberPro powered serial adapter card include PCI v2.2 universal card standard, PCI-X and 64-bit compatible, RoHS, and FCC Class B (DoC) and CE regulatory approved.