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Compact USB to serial adapter with DB-9 male and USB Type-B connectors, 0.5m cable

Brainboxes

Brainboxes US-320 USB to RS-422/485 Serial Adapter

SKU CH-FNJY-AJY1Y MPN US-320

Connects RS-422/485 serial equipment via USB 2.0 with 512-byte buffers and baud rates up to 921,600

  • Adapter typeSerial/USB
  • DetailsConnector on First End:1 × 9-pin DB-9 Male RS-422/485 Serial
  • In the boxUltra 1 Port RS422/485 USB to Serial Adapter 0.5m USB Cable
  • Reliable native COM port across Windows 32 and 64 bit systems with Microsoft signed drivers
  • Compact design measuring .9 by 1.6 by 1.5 inches fits tight spaces
  • High retention USB 2.0 connector prevents accidental disconnection during use
  • Supports baud rates up to 921600 with 512 byte Tx and Rx buffers for data integrity
  • Includes .5 metre cable CD manual and quick start guide for immediate setup

One-port RS-422/485 adapter

The Brainboxes US-320 adds a single 9-pin DB-9 male serial port to any computer with a USB 2.0 type-B socket. It is built for industrial and legacy equipment that still relies on RS-422 or RS-485 signalling.

Engineers maintaining serial gear

Technicians who need a reliable COM port for PLCs, meters or older industrial devices will find the Microsoft-signed drivers and 512-byte buffers deliver stable communication up to 921600 baud. Users who require multiple simultaneous serial ports or a different connector type should look at another adapter.

Check USB port and OS support

Verify that your host has a free USB 2.0 type-A port for the supplied .5 m cable and that your operating system appears in the supported list — Windows XP through 8, Server 2003 and 2008, 32-bit and 64-bit, plus Linux, Mac OS X and Raspberry Pi.

How it compares

Measured against everything we stock in Other Adapters & Couplers, at today’s prices. Recalculated every night.

Price $73.99
Pricier than about 90% of the 1,761 comparable items (median $18.99).

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Specifications

Product
Brand nameBrainboxes
Model nameUS-320
Adapter typeSerial/USB
Size & build
Shipping weight0.05 kg
Package size41 × 38 × 23 mm
In the box
In the boxUltra 1 Port RS422/485 USB to Serial Adapter
0.5m USB Cable
Installation CD Including Manual
Microsoft Signed Drivers & Utilities
Quick Start Guide

Questions about this item

Does my computer need a USB 2.0 Type B port to connect the US-320 adapter?

The adapter plugs into a standard USB 2.0 Type A host port; the Type B male connector is on the adapter end of the included 0.5 m cable.

Will the US-320 run on a 64-bit Windows 7 machine alongside my legacy serial devices?

Microsoft signed drivers support 32-bit and 64-bit Windows XP, Server 2003, Vista, Server 2008, Windows 7 and Windows 8, so the adapter appears as a native COM port for existing RS-422/485 gear.

How can I verify the US-320 is communicating at the baud rate my equipment requires?

Install the supplied drivers, open Device Manager, confirm a new COM port appears, then use the Brainboxes utilities or a terminal program to match any standard or arbitrary rate up to 921600 baud.

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