The IA-3127-U is an intelligent 24-ch Relay Controller, with 24-ch Digital Input and multi-drop operation capability, in the original IA-3131 foot print. The IA-3127-U is an Industrial grade relay controller, handles both 'Dry-Contact' and 'Wet' inputs, activated by GND or Positive Signal, user defined, easy operated, supported by a simple, yet, powerful software command set. Rich software support, including open source code samples, setting utility and control utilities makes it fast and easy adapted device. The IA-3127-U is part of the IA-3000 Series. This series includes Relay controllers, Digital and Analog controllers, usually equipped with USB, RS-232/485, IP or wireless communication ports.