3U Compact PCI 2-Port RS-232, RS-422, RS-485 Isolated Serial Interface

Part: 7903   Model: ISO COMM2.cPCI

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This product is classified as legacy and is not recommended for new or high volume designs.

Sealevel will support legacy products through technical and warranty support, software drivers and product manuals. Please contact Sales for further information. For new product designs, we recommend the 7203e.

The 7903 is a 3U Compact PCI interface adapter with two isolated serial I/O ports. It provides two field selectable RS-232, RS-422, or RS-485 serial ports supporting data rates up to 921.6K bps. Isolation is important in installations where the equipment connected to the PC is either located far from the host system, or on a different power transformer circuit.

Note: This item has a minimum order quantity (MOQ) of 25 units. Please contact your sales representative with any questions.


Additional information

Communications Chip


Electrical Interface

RS-232, RS-422, RS-485

Humidity Range

10 – 90% Relative Humidity, Non-Condensing

Host Interface(s)

Compact PCI

Max Data Distance

4000 feet

Max Data Rate

921.6K bps

Optically Isolated


Operating Temperature

0°C to 70°C (32°F to 158°F)

# of Ports


Serial Connector(s)


Storage Temperature

-50°C to 105°C (-58°F to 221°F)

UART Series

850 UART

  • Hot Swap compliant (PICMG 2.1 Rev. 3.0)
  • PCI bus 2.2 compliant
  • Automatic RS-485 Enable and Disable
  • Supports data rates up to 921.6K bps
  • 16850 buffered UART standard
  • Universal 3.3 and 5V compatible
  • Full RS-232 control signals supported

Windows Software

Software: SeaCOM - Windows

Linux Software

Software: SeaCOM - Linux


Datasheet: 7903


Manual: 7903


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