Advantech-Innocore's DPX®-Series boards have a GPIO header that is a very flexible multi-purpose interface that can be used to connect a variety of simple one- or two-wire devices. The Dallas iButton® is one such device and iButton devices are available
for a number of different functions. The GPIO interface supports any 1-wire® bus device and typical uses could include special purpose I/O, security, memory and data storage.