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Async RS232 to RS422/485 interface converter DB9 to Terminal Block

Convert async RS232 to RS422/485 at speeds up to 460.8 kbps with distances up to 4000 ft over CATx cables in industrial environments with DIN Rail mounting.


14 In Stock
Same Day Shipping (before 5PM ET)
1 Year Double Diamond™ Warranty (Standard)

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Product Features

  • Features 10–30-VDC operation and withstands temperature extremes of -40 to +176° F (-40 to +80° C).
  • Designed to protect expensive control equipment.
  • Three-way isolation, 1000-V input/output.
  • Features 2k-V isolation with ESD protection.


  • UL® approved.
  • 8-kV contact; 15-kV air.
  • Built-in switchable bias and termination.
  • Converts unbalanced half- or full-duplex RS-232 signals to balanced full-duplex RS-422 or 2-wire half- or 4-wire full-duplex RS-485.
  • Rugged IP30-rated metal case.
  • Supports wide range of data rates.
  • Includes mounting ears for attaching to a panel.
  • Can also be conveniently mounted on a DIN rail with optional clip (DRCLIP).

  • Tech Specs

    CE Approval Yes
    Connectors (1) 5-position terminal block (RS-422/485), (1) DB9 F (RS-232 DCE), (1) 2-position terminal block (power)
    Operating Environment Temperature: -40 to +176° F (-40 to +80° C); Humidity: Up to 95%, noncondensing
    Operation RS-232: Half- or full-duplex; RS-422: Full-duplex; RS-485: 2-wire half-duplex or 4-wire full-duplex
    Power +10 to 30 VDC from an external power supply (if needed, please contact Black Box Tech Support)
    Size 3.9"H x 2.9"W x 0.9"D (9.9 x 2.3 x 7.4 cm)
    Speed 460.8 kbps

    This product works with our:
    • DIN Rail, 1-m (3.2-ft.) (DR100).
    To mount the converter to the DIN rail itself, you will need our mounting clip (DRCLIP), available by special order by contacting Black Box 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.



    Double Diamond Warranty Diamond

    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 Async RS232 to RS422/485 interface converter DB9 to Terminal Block 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.