Star Tech. com 2 Port RS232/422/485 PCI Serial Adapter Card w/ ESD Protection Add RS232, RS485, and RS422 support to a PC with a single PCI add-on card. 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.