SER2PCI3V-L & nbsp; serial I / O cards offer two independent RS-232 serial ports. This I / O board supports both 3.3V and 5V PCI bus, and it is compatible with 32-bit PCI, 64-bit PCI and PCI-X bus. All serial ports are built by 16550A-compatible UARTS with 16-byte FIFO. A rich set of driver options is configured via the Device Manager in Windows. The drivers allow to configure the serial ports for a bit-rate of up to 921,600 bps.