USB-232-IND, USB-422-IND, USB-485-IND, USB-422-485-IND

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  • RoHS compliant, single-port serial communications adapter for USB 2.0 or 3.0
  • Add a RS-232, RS-422 or RS485 serial port to any USB equipped computer
  • Compact, industrial, military-grade metal backshell
  • Industrial operating temperature (-40°C to +85°C) standard
  • Includes type FT232R UART with 128-byte receive/256-byte transmit FIFO buffers
  • Supports 7 or 8 data bits, 1 or 2 stop bits, and odd /even / mark / space / no parity
  • ±15kV ESD Protection (IEC 6100) on all RS-232/422/485 signals protects against spikes and ground loops
  • Fully shielded cable protects data from EMI and RF interference
  • Software programmable baud-rates
  • All required power drawn from host USB port, no external power adapter required
  • Supported for use in Windows (including Windows CE) and Linux operating systems
  • Designed, made, supported, and manufactured in the USA


  • Supports all RS-232 signals, including handshaking
  • Data transfer speeds up to 1Mbps asynchronous


  • Supports full-duplex (4-wire) RS-422 protocol
  • Data transfer speeds up to 3Mbps asynchronous


  • Supports multi-drop (2-wire, half-duplex) RS-485 protocol
  • Data transfer speeds up to 3Mbps asynchronous


  • Supports full-duplex RS-422/485 protocol
  • Supports 4-wire RS-485 protocol
  • Data transfer speeds up to 3Mbps asynchronous
  • Pinout compatible with legacy model USB-485


  • Removal of RC Termination from receiver lines (RS-422 and RS-485 models)
  • To fully comply with IEC60945 and IACS E10, the factory option Halogen Free Flame retardant (HFFR) cable is required
Last updated on November 2, 2023, 6:26 pm


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The USB to serial IND series are rugged, industrial, serial communications adapters designed for use in demanding real-world applications such as transportation, military, embedded control systems, remote data acquisition, mobile, and more. These intelligent modules provides a cost-effective solution for transferring high-speed asynchronous serial data over USB. Use legacy serial devices with any PC or embedded system with a USB port. The adapters provide easy connectivity between the computer and standard communication ports or remote serial devices. No PC reconfiguration, assignment of IRQs, or jumper settings required. The adapter will be recognized as a USB to Serial Adapter and install in the system as a standard COM port.

For environments requiring Halogen free equipment, we provide the -HF option that is tested according to IEC60945 and IACS E10 standards.


  • Printers
  • Scales
  • Transportation
  • Barcode Readers
  • Mobile
  • GPS Devices
  • Point of Sale
  • Medical


The ADAP9 accessory provides a screw terminal connection to break out the RS-232, RS-422, or RS-485 signals on the DB9M connector.

Connections to System

The USB serial converter is equipped with a 6 foot, fully shielded USB cable, a USB type A connector for connection to a computer USB port, and a male DB-9 for connection to a RS-232, RS-422, or RS-485 equipped data or communication terminal.


The USB serial converter installs into any operating system as a standard serial COM device, allowing all 3rd party software to operate the serial port as usual. Samples in a variety of languages and environments are provided, including a Windows utility “WinRISC”, a “Really Incredibly Simple Communications” terminal program. Drivers are provided for Windows (including Windows CE) and Linux, and are available at no cost for most other operating systems.


Data Sheets


Drivers and Downloads

Full list of available Downloads: Software Packages, Drivers, Manuals, and other documents

Information about our Free Software packages:

ACCES is proud to provide a full suite of software support with every Data Acquisition product. We are committed to supporting the most popular operating systems and platforms for our customers. Currently we are actively supporting XP -> 10, both 32 & 64 bit, including “Server 2008,” “Embedded,” and “Compact” flavors for all plug-and-play products including PCI, PCI Express, USB, and more. Many products continue to ship with support for additional operating systems such as DOS, Windows 95, 98, Me, NT4, and 2000.


Among the software we deliver with our products are sample programs in a wide variety of programming languages. These samples are used to demonstrate the software interfaces to our products — and many can be used as-is in your production environments, or to test functionality of the devices out-of-the-box. We’re currently actively supporting sample programs in Microsoft Visual C#, Visual Basic, Delphi, and Visual C/C++, with many devices including samples in Borland C/C++ 3.1 for DOS. Additionally we provide National Instruments LabVIEW compatible DLLs and many demonstration VIs for our devices.


Drivers for various operating systems are also provided, including active support for Windows XP -> 10 — all in both 32-bit and 64-bit flavors, and including consumer, server, and embedded varieties — as well as the 2.6 and newer Linux kernels and recent OSX / macOS versions. Many products continue to ship with driver support for Windows 95, 98, Me, NT4, and Windows 2000, but support for these operating systems is considered deprecated.

Setup Programs and Utilites

Our Data Acquisition devices also include a graphical setup utility that walks you through the process of configuring any option jumpers or switches on the device, as well as explaining a little about the various connectors present.

Many devices also include utility programs – little tools to make your use of the device easier, such as EWriter, a program that allows you to read and write data in the user-accessible EEPROM locations on all our USB data acquisitition products; or WinRISC, a “Really Incredibly Simple Communications” terminal program that lets you get started instantly with serial devices.

“Register Level” Documentation

Besides all this software in all these languages and operating systems ACCES has a policy of open and transparent development: none of our lowest-level “register” interfaces are hidden from you — we document every register in every bus card, every command in every serial board, and every usb control transfer in every USB Data Acquisition board. These lowest-level interfaces allow you to develop for our products in ANY operating system or language, regardless of our actively supporting it or having a driver for it. We have customers actively developing in ADA, Android, Python, Java, MATLAB, Solaris, and more, just by referring to our complete low-level interface documentation! And we provide the full source code to all of our drivers, regardless of operating system, to give you an even bigger head start in your own development tasks.

No Fees or Royalties

All of this software is provided at no additional charge, and is licensed under any of a variety of flexible — and royalty free — options. Check out our software license explanation if you’d like more information.

Custom Software

ACCES also offers Custom Software Services for our products. Our prices are unbelievably low, often as inexpensive as free! If you need something tweaked to support your needs, or an entire enterprise application developed from scratch, it is definitely worth your time to inquire with us, first.

Further information about available ACCES Software:

Redistributing Windows Drivers
A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.

Communications Interface

DB-9 Male Pinout
Pin RS-232 RS-422 RS-485 RS-422/485
1 DCD Rx- Tx/Rx- Rx-
2 RX Tx+ Tx/Rx+ Tx+
3 TX Tx- Tx/Rx- TX-
4 DTR nc nc nc
6 DSR nc nc nc
7 RTS nc nc nc
8 CTS nc nc nc
9 RI Rx+ Tx/Rx+ Rx+
  • Serial Standard: RS-232, RS-422, RS-485, RS-422/485
  • Connector: DB-9, Male
  • Communications Chip: Type FT232R UART with 128-byte receive/256-byte transmit FIFO buffers
  • Character Length: 7 or 8 bits
  • Parity: Even, odd, mark, space or none
  • Stop Interval: 1 or 2 bits
  • RS-232 Serial Data Rates: 300bps up to 1Mbps asynchronous
  • RS-422 Serial Data Rates: 300bps up to 3Mbps asynchronous
  • RS-485 Serial Data Rates: 300bps up to 3Mbps asynchronous
  • Input/Output Voltage: ±25V (RS-232), ±14V (RS-422/485)
  • Transmitter Output Drive: Up to 60mA, with thermal shutdown (RS-232)
  • Receiver Input Sensitivity: ±200mV
  • ESD Protection: ±15kV on all signal pins
  • RTS Control: Automatic in RS-485 mode
  • Bias: Transceiver and Receiver via 10KΩ (RS-422/485 models)
  • Termination: 120Ω w/0.01µF capacitor (RS-422/485 Factory Option)

Bus Type

  • USB Specification: Full-Speed USB 2.0 device, USB 3.0 and 1.1 compatible


  • Operating Temp: -40°C to +85°C
  • Storage Temp: -65°C to +150°C
  • Humidity: 5% to 95%, non-condensing
  • Power Required: 5VDC at ~12mA with no load (~22mA loaded) USB Bus Powered (No external power supply required)
  • Cable Length: 6 feet
  • Backshell Dimensions: 1.236″ x 0.657″ x 2.094″ (31.4mm x 16.7mm x 53.2mm)
  • Approvals: RoHS

Regulatory Compliance

  • This product is designed to be in full compliance with CE requirements.

ModelDescriptionPrice (USD)

Industrial strength single port USB to RS-422 serial interface adapter


Industrial strength single port USB to RS-485 serial interface adapter


Industrial strength single port USB to 485-4-wire serial interface adapter


Industrial strength single port USB to RS-232 serial interface adapter

ADAP9 Screw terminal breakout board with DB9F connector $19
Model Options:
-Term RC Termination to prevent ringing and reflections (RS-422 and RS-485 models)
-HF Halogen free flame retardant cable tested according to IEC60945 and IACS E10 standards