The SeaI/O-520N is a versatile expansion module ideal for adding optically isolated inputs and high-current relay outputs to your SeaI/O network. With RS-485 Modbus RTU compatibility, this module easily integrates into any Ethernet, USB, RS-485, or RS-232 based SeaI/O system. Perfect for industrial applications, it can control high-current devices using the Form C relays and gather input data from isolated sources with high protection.