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Compact Bidirectional Dual Bus AutoSwitch, 4-to-2

Give four users simultaneous access to two devices.


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

Product Features

  • Connect four users to two parallel devices.
  • Fully compatible with IEEE 1284, ECP/EPP, Centronics®, Byte, and Nibble modes.
  • Supports printers; scanners; Zip™, tape, and CD-ROM drives; digital cameras; and more.


  • Automatically senses Bi-Tronics or Centronics printers.
  • Plug-and-play! Software included.
  • Operates in autolink or manual mode.
  • Built-in microprocessor provides real-time communication.
  • Data transfer rate up to 2 MBps.

  • The Bidirectional Dual Bus AutoSwitch, 4-to-2, from Black Box enables you to connect four computers to two IEEE 1284 Bi-Tronics printers or other parallel devices. The dual bus architecture features two independent channels for simultaneous access to parallel devices and file transfer. This switch works with DeskJet printers and multifunction machines, and supports Windows 3.1/95/98, Windows NT®, Windows 2000, and Windows Me.

    This product works with:
  • Optional Power Supply (PS121-R2)
  • Enhanced Parallel Port Cables (EQN200–EQN202)
    Questions? Contact our FREE Tech Support.

  • Tech Specs

    CE Approval Yes
    Connectors (6) DB25 F
    Distance From the interface: Up to 15 ft. (4.6 m); From the optional power supply: 15–50 ft. (4.6–15.2 m)
    Operating Systems Supported DOS, Windows 3.x/95/98/Me, Windows NT, and Windows 2000
    Power From the interface or the optional power supply
    Size 1"H x 7.5"W x 3.6"D (2.5 x 19.1 x 9.1 cm)
    Transfer Rate (Maximum) 2 MBps
    Weight 0.5 lb. (0.2 kg)
    This product works with:
  • Optional Power Supply (PS121-R2)
  • Enhanced Parallel Port Cables (EQN200–EQN202)
    Questions? Contact our FREE Tech Support.

    * 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.

  • Support


    Double Diamond Warranty

    Extended 1 Year Warranty Available

    Protect your purchase with an additional 1 Year Double Diamond™ warranty!
    Cost: $16.30

    Extended 3 Year Warranty Available

    Protect your purchase with an additional 3 Year Double Diamond™ warranty!
    Cost: $32.59


    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 Compact Bidirectional Dual Bus AutoSwitch, 4-to-2 comes with a standard 1 YEAR warranty 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.