S1 initiates reading of the DIP switches and a power dropout from 1 to 512 half cycles (8.3 ms to 4.3 s at 60 Hz), depending on the setting of the nine switches.

Fig. 2 is a block diagram representation of the +5 VDC power supply. The +3.3 VDC power supply, also in the data link, is functionally identical. The front end of the supply consists of a three ...