PCI Express serial interface
This serial interface delivers flexibility for expanding serial communications. Compatible with any PCI Express slot, the board provides eight multifunction serial ports, each individually field-configurable for RS-232, RS-422 or RS-485. The Ultra COMM+8.PCIE utilizes 16C954 UARTs with 128-byte Tx/Rx FIFOs, which enable data rates to 921.6kb/s for reliable high-speed communications in data
intensive applications. This high-performance UART includes 9-bit framing support and is register compatible with legacy 16550 software applications. In addition, the board derives a 62.5MHz clock from the PCI Express bus. In RS-485 mode, the board provides automatic control of the RS-485 driver in hardware. In RS-232 mode, all modem control signals are implemented for maximum compatibility with a
variety of serial peripherals
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