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The PCI2S232485I PCI Serial Adapter Card lets you turn a PCI or PCI-X slot into 2 serial ports capable of communicating in RS-232 RS-422 or RS-485.This universal all-in-one adapter not only features two DB9 serial ports that can be independently configured but also supports nearly any configuration: RS-422 RS-485 2-wire RS-485 4-wire or RS-232 operating modes. Designed for reliability this 2-port PCI Serial card also features built-in ESD (Electro-Static Discharge) protection to ensure that connected serial devices remain protected.