We develop a new I-87120 firmware library which allows users to define their special functionalities. There are four functions provided by firmware library:

1. UserInitFunc：Users can do some initialize configuration in this function.
2. UserDefCmdFunc：Users can define new commands which is used for communicating with host (I-8000 main control unit/WinCon-8000/LinCon-8000).
3. UserLoopFunc：Users can do some repeated works by using this function.
4. UserIrqFunc：Users can do something after CAN controller produces an interrupt signal.

Users can make the users’ firmware of I-87120 just coding these four functions and re-compile. If users want to use the original firmware of I-87120 just keep these four functions empty and re-compile.

For more detail, please refer to
http://www.icpdas.com/products/Remote_IO/can_bus/I-87120.htm