The IA-3127-U is an intelligent 24-ch USB 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, easy operated, supported by a simple, yet, powerful command set. Rich software support, including open source code samples, setting and control utilities makes it fast and easy adapted device. The IA-3127-U is part of the IA-3000 Series. This series include Relay controllers, Digital and Analog controllers, usually equipped with RS-232/485, IP or wireless communication ports.