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Async RS-232 to RS-422/485 Interface Converter - DB9 to Terminal Block

Convert async RS232 to RS422/485 at speeds up to 19.2 kbps with distances up to 4000 ft over CATx cables in industrial environments with DIN Rail mounting.


22 In Stock
1 Year Double Diamond™ Warranty (Standard)

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Product Features

  • Transmit data up to 19.2 kbps or at distances up to 4000 ft.
  • Withstands operating temperatures of -40 to 176 degrees F (-40 to 80 C).
  • 2-wire half-duplex or 4-wire full-duplex, RS-422 Full-duplex
  • Async (data leads) only.
  • Powered by 10–30 VDC, 100 mA
  • Optically isolates and converts unbalanced half- or full-duplex RS-232 signals to optically isolated and balanced full-duplex RS-422 or 2-wire half- or 4-wire full-duplex RS-485.
  • Switch-selectable data rates between 2400 bps and 19.2 kbps.


Convert async RS232 to RS422/485 at speeds up to 19.2 kbps with distances up to 4000 ft over CATx cables. These devices are great for connecting RS232 devices into an existing RS422/485 environment in factory automation, building automation, and process automation. They can be mounted using DIN Rail and can withstand operating temperatures of -40 to 176 degrees F (-40 to 80 C).

Tech Specs

CE Approval Yes
Connectors (2) 6-position terminal blocks, (1) DB9 F (DCE)
Distance (Maximum) 4000 ft. (1219.2 m)
Indicators (3) LEDs: (1) RS-485 transmit data, (1) RS-485 receive data, (1) power
Isolation 2000 VAC optical isolation of data signals and ground
Operating Environment Temperature: -40 to +176° F (-40 to +80° C); Humidity: Up to 95% noncondensing
Operation RS-232: Half- or full-duplex; RS-485: 2-wire half-duplex or 4-wire full-duplex; RS-422: Full-duplex
Power 10-30 VDC, 100 mA
Size 1"H x 3.1"W x 4.2"D (2.5 x 7.9 x 10.7 cm)
Speed 2400 bps to 19.2 kbps, switch-selectable; other rates available between 1200 bps and 115.2 kbps
Surge Suppression Bidirectional avalanche breakdown device: 7.5 V; Peak power dissipation: 500 W; Clamping time: <1 psec
This product works with:
Product works with:
  • DIN Rail (DR100)
  • DIN Rail 12-VDC Power Supply (PSD100) for powering up to six converters
  • DB25 to Terminal Block Adapter (IC980)
  • DB9 Male/Female Serial Extension Cables (BC00200, etc.)
  • Individually Shielded Low-Capacitance Cable—Extra Distance, 4 Conductors (ERN04A)
    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.

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    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.