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Async RS422/485 to RS422/485 repeater TB to TB

The optical repeaters/isolators add 4,000 feet (1.2 km) and another 32 nodes to an RS485 data circuit in an industrial environment with DIN Rail mounting. 


7 In Stock
Same Day Shipping (before 5PM ET)
Extended Double Diamond™ Warranty Available (3 Additional Year)

*Required field

Product Features

  • A heavy-duty, industrial-strength repeater.
  • Extends RS-422/485 signals an additional 4000 feet (1219.2 m).
  • Rugged, IP30-rated metal case for panel mounting.
  • Tolerates temperatures ranging from -30 to +185º F (-34 to +85º C).
  • 2G shock and 3G vibration protection.
  • Boasts 2-kV triple isolation for safeguarding data and equipment.
  • Supports an additional 32 more nodes in your multidrop network.


  • Tolerates temperatures ranging from -30 to +185º F (-34 to +85º C).
  • 2G shock and 3G vibration protection.
  • Boasts 2-kV triple isolation for safeguarding data and equipment.
  • >
  • Supports an additional 32 more nodes in your multidrop network.
  • Modbus® and ASCII/RTU compatible.
  • Data rates up to 115.2 kbps.
  • DIN rail mountable with optional adapter.

  • This heavy-duty Industrial Opto-Isolated RS-422/485 Repeater enables you to extend serial transmissions much farther in harsh environments.

    In fact, it boosts full- or half-duplex RS-422/485 signals an additional 4000 feet (1219.2 m)—doubling the distance that's ordinarily supported in an RS-422/485 system. What's more, the repeater enables you to add another 32 nodes for a larger multipoint communications network.

    Tough, plus three levels of isolation.
    Encased in an IP30-rated enclosure, the repeater's been put through some of the most exacting tests in the industry. The high-grade repeater meets the requirements of two standards that make it suitable for electrical substation installations—IEC 61850-3 and IEEE 1613—specifications that are more stringent than NEMA TS1/TS2 requirements for transportation applications.

    In addition, the Industrial repeater features 2-kV triple isolation, protecting equipment as well as data from rogue currents and ground loops. It provides powerful isolation on both data ports, and with additional isolation on the repeater's power supply circuits, you're given a third degree of protection for your expensive components.

    This level of protection helps prevent stray currents from disrupting important data communications, such as those in factory, engineering, military, defense industry, or utility applications.

    By isolating voltage anomalies, you stand a much better chance of preventing a surge from shutting down an assembly line—or your entire plant.

    Simple to set up.
    The Industrial Opto-Isolated RS-232 to RS-422/485 Converter supports serial Modbus® connections for both ASCII or RTU (remote terminal unit) formats.

    Each RS-422/RS-485 connector on the repeater has a removable 5-position terminal block. DIP switches on the back of the Industrial Opto-Isolated RS-422/485 Repeater enable you to configure it for RS-485 2-wire half-duplex, RS-485 4-wire full-duplex, or RS-422 full-duplex communications.

    For additional ease of setup, bit-wise enabled circuitry detects the data rate automatically without you having to set a DIP switch. An automatic send data control feature enables an RS-485 serial port to be used in Windows® applications where you have no control over the handshake lines.

    In addition, the repeater has built-in switchable bias resistors (1.2 kilohm) on transmit and receive ports, as well as switchable termination (120 ohm).

    NOTE: Power supply not included.

    Tech Specs

    Approvals IEC 61850-3, IEEE 1613, CE, RoHS
    Connectors (2) 5-postion terminal blocks (removable)
    Data Rate 1.2-115.2 kbps
    Dimensions 1.3"H x 3.7"W x 5.2"D (3.3 x 9.4 x 13.2 cm)
    Distance 8000 ft. (2438.4 m) maximum
    Enclosure IP30-rated metal, panelmount
    Indicators LEDs: (1) Power, (1) TD (transmit data) and (1) RD (receive data) on both RS-422/RS-485 connectors
    Operating Environment Temperature: -30 to +185° F (-34 to +85° C); Humidity: 0 to 95%, noncondensing
    Power From an external power supply (not included*); Input: 10-48 VDC (56 VDC maximum) on 2-position terminal block (removable); Consumption: 0.5 W typical (2.3 W with termination)
    Weight 0.5 lb. (0.2 kg) * See our PS1003 power supply, available separately.
    This product works with:
    Power supply not included.

    * 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: $27.90

    Extended 3 Year Warranty Available

    Protect your purchase with an additional 3 Year Double Diamond™ warranty!
    Cost: $55.79


    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 RS422/485 to RS422/485 repeater TB to TB comes with a standard 5 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.