Keri's NXT-WI Wiegand Interface Module is designed to make it easy to connect reader technologies with industry standard Wiegand output to NXT Controllers. The NXT-WI securely plugs directly onto an NXT Controller or an NXT-4X4 or GIOX I/O Expansion Module with excellent mechanical and electrical integrity. The option to bring the reader terminations to the I/O modules provides substantial savings in wiring costs because door functions can be located closer to the reader/door, with only 4 wires required to be cabled to centrally located controllers.