This product is either discontinued or we cannot get that from suppliers.
Sunix SER5056AL, Interface RS-232, Controller SUNIX SUN1999 (16C950 UART Compatible), Bus Universal PCI 64/32bit 3.3V/5V PCI Ver 3.0, 2.3, 2.2, 2.1, FIFO 128 byte (Hardware), Baud rate 50 bps to 115.2 Kbps, Data bit 5,6,7,8, Flow Control None, Xon/Xoff, RTS/CTS, DB44 Female.
SUNIX SER5056AL, Universal PCI serial communication board, allows users to add or expand four RS-232 ports on PC-based system. The card is compatible with both 64 / 32-bit PCI architecture supporting 3.3 and 5V Bus, allowing it to be installed in any slim size PC-based.