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PCI bus serial board four port RS422/485 four DB9

Provides four RS422/485 serial ports when the card is installed in an open PCI slot in your computer.


Please call 877-877-2269 for a replacement product or part.
Extended Double Diamond™ Warranty Available (3 Additional Year)

Product Features

  • Use one open PCI slot in your computer to add Four RS-422, or RS-485 ports.
  • Use ports as RS422 for long distance device connections
  • Use ports a RS485 and capture data from multiple peripherals
  • In RS485 mode up to 31 devices can be attached to each port
  • Card has a 16850 UART providing speeds up to 460.8 kbps


  • Use RS-422 in areas where noise immunity and high data integrity are essential.
  • Select RS-485 to capture data from peripherals in a multidrop network.
  • Autoenable circuitry enables the RS-485 transmitter during data transmission.

  • These products work with:
  • DB25 Serial Null-Modem Cable (BC00501)
  • DB25 to Terminal Block Adapter (IC980)
  • DB9 to Terminal Block Adapter (IC981)
    Questions? Contact our FREE Tech Support.

  • Tech Specs

    Buffer IC971C, IC189C: 128-byte FIFO; IC141C-R2: 16-byte FIFO
    CE Approval Yes
    Connectors IC971C: (1) DB25 M; IC141C-R2, IC189C: (1) DB37 M on card, (1) DB37 F and (4) DB9 M on the included cable
    Distance (Maximum) 4000 ft. (1219.2 m)
    Operating Systems Supported Windows®, Linux®, QNX
    Operation 2 or 4 wires
    Speed IC971C, IC189C: 460.8 kbps (sustained); IC141C-R2: 115.2 kbps

    * Technical specification weight is the unit weight. It is not the packaged shipping weight. For shipping weight, please contact Black Box customer service at 877-877-2269.




    Double Diamond Warranty

    Extended 1 Year Warranty Available

    Protect your purchase with an additional 1 Year Double Diamond™ warranty!
    Cost: $43.30

    Extended 3 Year Warranty Available

    Protect your purchase with an additional 3 Year Double Diamond™ warranty!
    Cost: $86.59


    Double Diamond™ Warranty (Standard)

    Take the risk out of equipment purchases with the Double Diamond™ Warranty from Black Box Network Services.

    The Double Diamond Warranty is our warranty that protects your Black Box® brand products* from accidental damage, including drops, water, and power surges.

    The PCI bus serial board four port RS422/485 four DB9 comes with a standard 1 Year Double Diamond™ Warranty (Standard) already included.

    During the warranty period, Black Box Network Services will repair or replace your damaged equipment within one week of receipt at NO CHARGE!*

    Plus, get an Extended Double Diamond Warranty.

    You can also extend your warranty or protect a previously purchased Black Box® brand product** for an additional year—for only 10% of the purchase price! Or, extend your coverage for a full three years for only 20% of the purchase price!

    Ordering an extended warranty is easy: When viewing a product in your shopping cart, just select the one or three years of additional coverage in the dropdown menu under “Warranty Options.” For details, contact Customer Service at 724-746-5500.

    * Warranty subject to certain exclusions and limitations ** Certain products may not be eligible.

    What’s more, we also have a 45-day return policy. Simply call Customer Service for a Return Authorization (RA) number, return your product in new condition and in the original package, and receive a full refund.