USB to RS-232 Adapter

USB - RS232 (Serial) Adapter Windows OS X, Linux
SIO-U232

Connect barcode scanners,NFC-RFID scanners, scales, caller ID units, sensors, GPS receivers, smart card readers, modems, printers ... virtually any RS-232 device to your computer using the USB port.

For use with a USB port and compatible with Windows 8, Windows 7, Windows Vista, Windows XP, Win2K, Mac OS X, and Linux (2.4 kernel and later) and others
Two variants available, standard or '5VDC power on DB9 PIN-9'. See table below for driver information.

This handy adpater works with virtually all software that uses an RS-232 serial port, including the SerialMagic, and ScanChamp® products.

Also known by many names: USB-Serial adapters, USB-PDA adapters, and USB-RS-232 converters. Spelling can also depending on location so it may be called called USB-Serial adaptors, USB-PDA adaptors, or USB RS-232 adaptors, or USB RS232 adaptor. Contact us if you are seeking more information.

Do you have the standard unit?
Use the drivers on this page.

Do you have the USB-RS232 adapter that provides 5VDC power on DB9 PIN-9?
Works with OS X 10.8, 10.7, 10.6, ...
Click here for powered unit drivers.

USB RS-232 adapter provides USB 5VDC on DB9 PIN 9

Developers: This device works superbly with theSerialPort API and with Serialio.com's javax.comm.SerialPort.

Note: This USB serial adapter has been tested with ZTerm and CoolTerm on OS X.

USB to RS-232 Adapter products
USB - RS232 (Serial) Adapter Windows OS X, Linux

Detailed Setup and Driver Information

Windows

Windows users, please see this page.

Apple Mac OS X

The driver below only supports the Prolific-based adapters supplied by Serialio.com.
Download Mac OS X drivers for the USB-RS232 adapter. Supports all OS X systems from 10.1 through 10.6 - Intel and PPC-based systems "Universal Binary" (UB)
Release Date: 05/13/2011
Download Mac OS X drivers for the USB-RS232 adapter. Supports all OS X 10.7 "Lion" - Intel-based systems
Release Date: 05/13/2011

The driver below only supports the FTDI-based adapters supplied by Serialio.com.
Download Mac OS X drivers for USB-Virtual COM adapters. Supports OS X systems from 10.1 through 10.8 "Mountain Lion" - Intel and PPC-based systems "Universal Binary" (UB)
Release Date: 03/12/2012

See notes for using these adapters on OS X.

See notes for using this device on a Windows XP virtual machine through Parallels Desktop.

Apple Mac OS 8 and 9

The driver below only supports the Prolific-based adapters supplied by Serialio.com.
Download the Mac OS 8 and 9 drivers here. PL-2303 drivers (ver 1.2.0) for Mac OS 8.x and OS 9.x
Release Date: 03/14/2002

Linux

Linux with kernel 2.4 and later has drivers built-in (virtually all Linux machines shipping since early 2000's use the 2.4 kernel and later)

USB Hub Notes

The adapter works with virtually all powered USB hubs. With OS X use is painless, just plug-and-use. Windows versions prior to XP are notorious for quirky issues with devices on USB hubs, be sure to choose a good USB hub if you plan to use Windows prior to XP - this goes for all USB devices over hubs on older Windows, not just this USB to RS-232 adapter.

Application Notes

Review application notes about using the adapter.

In 2009 I upgraded to a computer system using Windows 7 Pro and of course no RS-232 serial port. I have been using an RSI-CED Millenium chronograph for years and have acquired an extensive amount of data over the years with this system. The manufacturer o

In 2009 I upgraded to a computer system using Windows 7 Pro and of course no RS-232 serial port. I have been using an RSI-CED Millenium chronograph for years and have acquired an extensive amount of data over the years with this system. The manufacturer of the chronograph recommended Serialio.com as a source for a USB to RS-232 serial adapter. I ordered one in January of 2010 and promptly received it. When I tried it, and the enclosed software, I could not get it to work on my system running Windows 7. Like a stubborn fool I would try different things and downloads with no success. I didn't bother to contact customer support until November 2010 - I figured for a $19.95 cable I would just be wasting more time. What a pleasant surprise!! I received a reply and a possible fix in a matter of HOURS!!! Due to my inexperience with Windows 7 I could not get the download, suggested by Serialio, to extract. I sent an email back explaining my problem and in less than an hour I had a reply and a solution to my problem!!! Any company that has customer support like this for an item as small as a $20. cable, and to still support it after 10 months of my procrastination, has to be one of the BEST companies out there!! Thanks again to Jordan for his quick, professional responses and to the SerialiO company for their excellent products. I would not hesitate to try any of their products in the future. 

Note: Device may not be exactly as pictured.