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Compact rectangular USB serial adapter with single port, matte finish, 38 by 41 by 22 mm, 24 g

Brainboxes

Brainboxes Ultra 1 Port RS422/485 USB Serial Adapter

SKU CH-90CH-3KT9R

Adds one RS422/485 serial port via USB 2.0 in a compact 22 mm high adapter weighing 24 g

  • Changer TypeSerial/USB
  • Compact 22 × 38 × 41 mm design fits tight spaces
  • USB 2.0 host interface works with PC, Mac and Linux
  • Single RS422/485 port adds legacy serial to modern systems
  • 24 g lightweight build simplifies mobile and embedded installs
  • Lifetime warranty and UK manufacture back long-term reliability

Compact USB-to-serial adapter for industrial use

The Brainboxes Ultra adapter adds a single RS-422/485 port to any PC, Mac or Linux machine through a USB 2.0 connection. Its 22 mm by 38 mm by 41 mm enclosure weighs 24 g and fits in tight panels or control cabinets. The device is built in the United Kingdom, carries WEEE and RoHS certifications and is TAA compliant for government procurement.

Passive cooling with no fan noise

The adapter draws power directly from the USB bus and operates without moving parts, so it adds no audible noise to the environment. Its small profile keeps heat dissipation low during continuous data transfer, making it suitable for always-on monitoring or automation tasks where silent operation matters.

Lifetime drivers and quick-start documentation

A supplied CD provides Microsoft-signed drivers and utilities for immediate setup, while a printed quick-start guide walks through port configuration. The lifetime limited warranty covers the hardware, and the included software bundle ensures long-term compatibility across Windows, macOS and Linux without additional licence fees.

Highlights

  • Compact 22 × 38 × 41 mm design fits tight spaces
  • USB 2.0 host interface works with PC, Mac and Linux
  • Single RS422/485 port adds legacy serial to modern systems
  • 24 g lightweight build simplifies mobile and embedded installs
  • Lifetime warranty and UK manufacture back long-term reliability

Specifications

BrandBrainboxes
Changer TypeSerial/USB

Questions about this item

How do I install the Ultra 1 Port RS422/485 USB Serial Adapter on Linux, and what step is often missed?

Connect the adapter to a USB 2.0 port, run the Microsoft signed driver installer from the included CD, then select the correct RS422 or RS485 mode in the utility before opening your terminal software.

What maintenance or replacement will the Ultra 1 Port RS422/485 USB Serial Adapter need over time?

The adapter has no moving parts or user-serviceable components; keep the USB connector and DB9 port free of dust, and replace the unit only if the USB 2.0 interface or the RS422/485 transceiver fails.

What limit appears first when the Ultra 1 Port RS422/485 USB Serial Adapter runs at full load for long periods?

The USB 2.0 host interface sets the maximum sustained data rate, so throughput will plateau at the bus limit before the RS422/485 transceiver or the 24 g enclosure reaches any thermal constraint.

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