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New PCI Express Board Provides Eight RS-232 Serial Ports

Author: Earle Foster
Date: 12/05/2013
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  • Eight RS-232 Ports with all Modem Control Signals
  • Fully compliant with all PCI Express X1 slots
  • Powerful 16C954 UARTs provide 128-byte FIFOs
  • Oscillator and clock prescalar support wide range of baud rates
  • Supports 9-bit protocol framing and data rates to 921.6K bps
  • Included 36" cable terminates to eight DB25M or eight DB9M connectors
  • Supported in Microsoft Windows and Linux operating systems

LIBERTY, SC, USA Sealevel Systems announces the 7803e, a new low-profile eight port RS-232 PCI Express serial interface adapter with advanced UART architecture. For maximum compatibility with a wide range of serial peripherals, the board supports all RS-232 modem control signals making it a perfect solution for interfacing to a wide range of peripherals.

The 7803e's serial ports utilize 16C954 UARTs with 128-byte Tx/Rx FIFOs that enables data rates to 921.6K bps for reliable high-speed communications in data intensive applications. This high-performance UART includes 9-bit framing support and is fully software compatible with legacy 16550 applications. In addition, the board derives a 62.5 MHz clock from the PCI Express link. This ultra-high speed clock is divided by a flexible 8-bit clock prescalar with 1/8 steps to provide support for the widest range of standard and non-standard baud rates.

All Sealevel PCI Express serial adapters include SeaCOM software for Windows and Linux operating systems. For easy installation and troubleshooting, customers also receive WinSSD, a full-featured application for testing and diagnostics including BERT (Bit Error Rate Testing), throughput monitoring, loopback tests, and test pattern message transmissions.

The 7803e is available immediately from stock priced at $449 for low-profile (Item# 7803e) and full-height (Item# 7803eS) PCI Express slots. Both items ship with a 36 inch cable that terminates to eight DB25M connectors. Both boards are also available with a 36 inch cable that includes eight DB9M connectors. Standard operating temperature range is 0 - +70C (extended temperature versions operating from -40C - +85C are available). Like all Sealevel I/O products, the 7803e is backed by a lifetime warranty.


Sealevel Systems, founded in 1986, provides industrial computing solutions in addition to a variety of communications and I/O products including PCI Express and PCI Bus cards, Ethernet serial servers, and USB serial adapters. The product line includes multi-port RS-232, RS-422/485, RS-232/422/485 multi-interface high-speed sync/async, and digital/relay I/O. For more information visit or call 864-843-4343.


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