The N-Series I/O boards are expansion modules for the BL210 distributed I/O system, providing flexible and scalable data acquisition. They support a wide range of signal types, including Digital Input (DI), Digital Output (DO), Analog Input (AI), Analog Output (AO), RTD, Thermocouple (TC), and serial interfaces (RS485/RS232). These boards enable seamless integration with BL210 systems for industrial automation, monitoring, and control applications.