DCPS receives three kinds of input from external sources.
There is a 5-kHz clock signal and several discreet clock events
driving individual interrupt lines on the real-time clock and
interrupt module (RCIM). There are several digital inputs on
a digital I/O card to handle resetting and overriding faults.
Finally, there are 64 differential analog input channels spread
across two cards. The signals consist of statuses, triggers, and
most importantly the instantaneous currents in each coil as
well as the plasma current. There are two channels for each
current, duplicated for redundancy and sent to different cards.