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Async RS485 to RS485 repeater TB/RJ45 to TB/RJ45

Extend your RS-485 network beyond 4000 feet and add up to 31 more devices.


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

Product Features

  • Crystal-clear controller signal out to 4000 feet (1219.2 m).
  • Opto-isolation available.
  • Support RS-422 4-wire connection.


Your RS-485 devices or segments can reach well beyond their normal distance limit with BLACK BOX® RS-485 Repeaters. We even have an opto-isolated model (IC158A) to protect your lines from ground loops and other electrical problems.

Tech Specs

CE Approval Yes
Connectors (2) 4-wire terminal blocks, (2) RJ-45
Flow Control Transparent
Indicators Both ports: Power, Carrier Detect
Leads Supported Both ports: TDA, TDB, RDA, RDB
Operation Half- or full-duplex
Power 115 VAC, 60 Hz (230-VAC, 50-Hz version on request)
Size 1.8"H x 5.5"W x 8.5"D (4.6 x 14 x 21.6 cm)
Speed Transparent up to 128 kbps
This product works with:
These repeaters do not feature collision detection or hardware flow control.

* 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: $12.00

Extended 3 Year Warranty Available

Protect your purchase with an additional 3 Year Double Diamond™ warranty!
Cost: $23.99


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 RS485 to RS485 repeater TB/RJ45 to TB/RJ45 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.