The ADAM-6251-AE is a modular I/O unit manufactured by Advantech. It is designed for sending or receiving digital inputs or outputs. The module supports a wide variety of communication protocols, including RS-485, Modbus, EtherCAT, and PROFIBUS. It also offers flexibility in its configuration, allowing it to connect to different types of networks. The module has a built-in self-identifying jumper for communication port selection, as well as a comprehensive range of status LEDs for quick diagnosis. It is certified to meet standards such as UL, CE and EN.