Ironically, there is an older, wired alternative that solves the power problem: the self-powered 20-mA current-loop interface (Figure 1). It’s easy to assume that this simple, ancient interface is ...

The whole thing, branded Novato, is loop-powered, and sends data back to the central office ... The firm has a more detailed description of the precision current interface on line in a paper titled ...

The Loop Fob is a small device that allows users to store credit card information on the iPhone, and then wirelessly pay at any traditional magnetic stripe reader. The Loop Fob can be used while ...