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Tough ultra small USB to serial adapter suitable for any environment. The closest you can get to an integrated serial port. High retention USB connector for an unbreakable connection. Have confidence, this product will match whatever baud rate your equipment needs without data loss. Includes large 512 byte Tx and Rx and high data throughput. Works across the full spectrum of baud rates up to 921,600 including standard and arbitrary values. We provide our own software drivers - eliminating many common problems with USB to Serial - giving you have a reliable, stable, native com port solution. Drivers for Windows 32 bit and 64 bit Operating Systems including Windows XP, Server 2003, Vista, Server 2008, Windows 7 and Windows 8 with additional drivers for Raspberry Pi, Mac OS X and Linux.Adapter Type: Serial/USBConnector on First End: 1 x 9-pin DB-9 Male RS-422/485 SerialConnector on Second End: 1 x Type B Male USB 2.0 USBHeight: 0.9Width: 1.6"Depth: 1.5"Weight (Approximate): 0.85 ozPackage Contents: Ultra 1 Port RS422/485 USB to Serial Adapter 0.5m USB Cable Installation CD Including Manual Microsoft Signed Drivers Utilities Quick Start Guide Green Compliant: YesGreen Compliance Certificate/Authority: RoHSGreen Compliance Certificate/Authority: WEEELimited Warranty: LifetimePackage Contents Ultra 1 Port RS422/485 USB to Serial Adapter 0.5m USB Cable Installation CD Including Manual Microsoft Signed Drivers Utilities Quick Start Guide "
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): Lifetime
- Limited Warranty period (labor): Lifetime
- Read full details
Return Policies
- Return for refund until: January 31, 2027
- Return for replacement until: January 31, 2027
- This item is covered by Newegg.com's Extended Holiday Return Policy.
- Read full return policy for details.
We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2026 and December 31, 2026 you will have until January 31, 2027 to return your product.
Manufacturer Contact Info
- Manufacturer Product Page
- Manufacturer Website
- Support Phone: 1-888-958-5538
- Support Email: support@brainboxes.com
- Support Website
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The Brainboxes US-320 is a one-port USB 2.0-to-RS-422/485 serial adapter with a Type B USB connector and a male DB-9 serial connector, suited to users connecting a computer’s USB port to equipment that uses RS-422 or RS-485.
Recommended For
- Field technicians using a laptop to configure, diagnose, or maintain equipment that communicates over RS-422 or RS-485 can use the US-320 to add a single serial port over USB. Its compact design and high-retention USB connection suit setups where space is limited or cables might be disturbed.
- Industrial controls integrators commissioning or servicing one RS-422/485 device at a time can use it to connect a USB-equipped computer to compatible serial equipment, including setups that require full- or half-duplex operation.
- Users maintaining a fixed workstation or control cabinet can use the US-320 where a small, wall-mountable USB-to-serial adapter and a single RS-422/485 connection fit the installation.
- Technicians working in hot or cold industrial environments can consider it for compatible RS-422/485 connections within its specified operating temperature range; the product is also listed as IP50-rated.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Connecting a USB host to a compatible RS-422/485 serial device through a DB-9 connection |
| Ports And Connectivity | One USB 2.0 Type-B male connection to one 9-pin DB-9 male RS-422/485 serial connection |
| Package Contents | Adapter, 0.5 m USB cable, installation CD with manual, signed drivers and utilities, and quick start guide |
| Physical Specifications | Item weight: 0.3 lb |
| Model Identifiers | Brainboxes US-320 |