Digi does not provide sample code. All Digi radios are designed to operate transparently with existing products. The application or device simply needs to be able to read and write to the UART or COM/serial port.
If you are not sure how to send and receive data over a serial port within the programming language you are using, please see one of the following resources available on the web:
All Microsoft based operating systems and programming languages including C, C+, C++, etc. please go to: http://msdn.microsoft.com
All Linux bases operating systems please go to: http://www.linux.com/
C+ and C++ http://www.cprogramming.com/