Low Profile PCI 1-Port RS-232, RS-422, RS-485, RS-530, RS-530A, V.35 Synchronous Serial Interface (uses Z16C32)

Part: 5104   Model: ACB-Ultra.LPCI

(3 customer reviews)

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The 5104 Low Profile PCI serial interface provides one synchronous serial port configurable for RS-232, RS-422, RS-485, RS-530, RS-530A, or V.35. The board is capable of data rates to 10M bps. The 5104 utilizes a Z16C32 Integrated Universal Serial Controller (IUSC) with built-in DMA controller and 32-byte FIFO buffer. The board is MD1 Low Profile and Universal Bus (3.3V and 5V) compatible.

The 5104 is compatible with any low profile PCI slot. A standard profile bracket  is also included.

Software support, critical for successful synchronous communication development, is provided through Sealevel’s SeaMAC synchronous serial driver. HDLC/SDLC protocols are supported as well as certain configurations of Monosync, Bi-sync and Raw modes.


Additional information

Communications Chip


Communications Controller


Electrical Interface

RS-232, RS-422, RS-485, RS-530, RS-530A

Humidity Range

10 – 90% Relative Humidity, Non-Condensing

Host Interface(s)


Max Data Distance

50 feet (RS-232)4000 feet (RS-485)

Max Data Rate

10M bps (burst)

Operating Temperature

0°C to 70°C (32°F to 158°F)

PC Bracket

Low Profile

# of Ports


RoHS Compliant


RS-485 Operation

Full Duplex (4 wire)Half Duplex (2 wire)

Serial Connector(s)


Storage Temperature

-50°C to 105°C (-58°F to 221°F)



  • Compliant with RoHS and WEEE directives
  • Configurable for RS-232, RS-422, RS-485, RS-530, RS-530A, or V.35
  • Z16C32 Integrated Universal Serial Controller (IUSC) with built-in DMA controller and 32-byte FIFO buffer
  • 256K bytes of onboard RAM/link list DMA supported
  • Data rates to 10M bps
  • MD1 Low Profile and Universal Bus (3.3V and 5V) compatible
  • Requires 3.3V power on PCI bus
  • DB-25M connector


Datasheet: 5104

3 reviews for ACB-Ultra.LPCI

  1. Braxton Technologies, LLC

    Satellite Telemetry Processing
    Having the requirement to generate and process high rate telemetry for a custom application we turned to SeaLevel for the 5104. The card has worked flawlessly in our implementation. Our software team found the API to be very user friendly and the technical support from SeaLevel is outstanding.

  2. Chuck

    Sealevel Systems 5104, PCI Bus High Speed SDLC Support.
    My company has now been using the Sealevel Systems 5104 card for high speed SDLC datalinks in simulation systems for developing and testing some shipboard systems. As the only vendor still supporting this protocol on the PCI bus at speeds > 1MBPS, they have been a KEY asset. To date, we have purchased ~150 cards. They have been instrumental in resolving computer system issues [Not Sealevel issues], that were not anticipated/understood at our end, and have been quick to repair the 3 cards that had hardware issues out of the box over time. We have two cards that have been in service since 1996 [Win NT 4.0], 40 that have been in service for 3 years now [Win XPro], and just bought another 100 for a new project[Win XP now, migrating to Windows 7 32-bit]. They worked with us to develop and beta test a Windows 7 64-bit driver…that is now available to all.

  3. Ken

    Great Hardware, Limited Protocol Support due to Windows Driver
    The 5104-16 (for 16 MHz oscillator as it normally comes with a 20 MHz oscillator) is a very versatile card from the hardware perspective. It will handle virtually any RS-422 protocol. However, the software drivers provided only support the most used protocols, so if you need one of the lesser used protocols, you will have to write your own windows driver to support it.

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