 The base board is similar to the STK500, in that it provides a power supply, clock, in-system programming, an RS-232 port and a CAN (Controller Area Network, an automotive standard) port via DE9 connectors, and stake pins for all of the GPIO signals from the target device.The target boards have ZIF sockets for DIP, SOIC, QFN, or QFP packages, depending on the board.The signal routing board sits between the base board and the target board, and routes the signals to the proper pin on the device board.