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Need some high-speed serial ports? The high performance, low maintenance PCI4S422DB9 lets you quickly and easily add two high-speed RS422/RS485 Serial interface ports to your system. This versatile card features on-card jumpers that let you configure each port as full or half-duplex depending on your needs. PRODUCT FEATURES: Offers data transfer rates of up to 230.4 Kbits/sec per port; Works with both 3.3 volt and 5 volt server slots.