The 942MB modules use two powerful micro-controllers, one for each channel, which perform advanced signal-processing functions and run self-diagnostic routines
for better reliability.
Such images could be highlighted with flashing signals to indicate the source of a problem during self-diagnostic routines
. (Audible voice messages--e.g., "Warning, Zone 1.
Built-in self-diagnostic routines
function when the system is operating, and four-way isolation separates inputs, outputs, relays, and power from each other to prevent ground loops and protect equipment from high-voltage transients.