Slick USB 2 Serial Library is a 3rd party software package for Android developers that enables the use of common USB to serial (RS232) adapters with devices running Android 3.1 and above that support USB host mode.
This is an example of an app with the library fully integrated. You can use this app to connect with any Prolific or FTDI based USB to serial cable and test sending and receiving data.
You can easily test this app by hooking up the necessary cables from your USB to serial adapter over to a COM port on your desktop. Then use a hyperterminal, such as Tera Term, to communicate with your Android device.
Just plug in, connect, configure (baud, parity, etc.), and go!
Check out the website for more info about the Slick USB 2 Serial Library.
If you have any questions, issues, or if you'd just like to share the setup you have it working with, please send an email!
v1.7 Updated to latest version of library
v1.6 Added option to force a driver profile if it doesn't auto connect
v1.5 Added support for FTDI cables
v1.4 Added support for Gigaware cables with the Prolific chip (usually found in Radio Shack)
v1.3 Added Adapter Info button to scan the details of attached adapters in case you have an unsupported adapter that you wish us to support in the future.