PCI 8-Port RS-232, RS-422, RS-485 Serial Interface

Part: 7804   Model: Ultra COMM+8.PCI

(1 customer review)


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The 7804 is a multi-interface, eight port, Universal Bus (3.3V or 5V) compatible PCI adapter. Offering eight individual field-selectable RS-232, RS-422, or RS-485 channels, the 7804 delivers ultimate flexibility for expanding serial communications.

The 7804 supports standard PC data rates and boasts a top speed of 921.6K bps. The board is designed using the XR16C864 UART, which provides a 128-byte FIFO, eight times larger than boards designed with 16C550 compatible parts. The larger buffers allow error free operation even in high-speed applications. In RS-485 mode the board provides automatic control of the RS-485 driver enable for trouble free network master arbitration. Additionally, RS-485 network termination, critical to robust multi-drop communication, can be selectively added to the circuit via DIP-switches.


Additional information

Communications Chip


Electrical Interface

RS-232, RS-422, RS-485

Humidity Range

10 – 90% Relative Humidity, Non-Condensing

Host Interface(s)


Max Data Distance

4000 feet

Max Data Rate

921.6K bps

Operating Temperature

0°C to 70°C (32°F to 158°F)

PC Bracket

Standard Height

# of Ports


RoHS Compliant


Serial Connector(s)


Storage Temperature

-50°C to 105°C (-58°F to 221°F)

UART Series

850 UART

  • Compliant with RoHS and WEEE directives
  • Each port individually configurable for RS-232, RS-422, or RS-485
  • 16C864 buffered UARTs with 128-byte FIFOs
  • Data rates to 921.6K bps
  • Universal Bus compatible (3.3V and 5V signaling)
  • Requires 3.3V power on PCI bus
  • Automatic RS-485 enable/disable
  • Included 36″ cable terminates to eight DB9M connectors (Item# CA145)

Windows Software

Software: SeaCOM - Windows

Linux Software

Software: SeaCOM - Linux


Datasheet: 7804


Manual: 7804

1 review for Ultra COMM+8.PCI

  1. JP

    Good stuff
    Solid product, reliable

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