The IA-3127S-U2i is an intelligent 24-ch Relay Controller, with 24-ch Digital Input and multi-drop operation ready, in the original IA-3131 foot print, The IA-3127S-U2i is an Industrial grade relay controller, handles both 'Dry-Contact' and 'Wet' Digital inputs, activated by GND or Positive Signal, user defined, easy operated, supported by a simple, yet, powerful software command list. This updated device includes Isolated USB port, 5 Amp relays ad Voltage Suppressor devices on all relays contacts to reduce EMI/RFI noise and to increase the device MTBF. Rich software support, includes open source code examples, setting and control utilities making it fast and easy adapted device. The IA-3127S-U2i 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.