Figure 6-30.--XY universal switch, schematic diagram.

assemblies, and associated mechanical drive

magnet operates in a similar manner to drive the

wipers in the Y direction, which is into the wire bank.

hardware. A simplified schematic of the XY switch is

shown in figure 6-30. The switch steps first in the X

The overflow, X-off normal, and Y-off normal

direction controlled by a series of ground (positive)

spring pileups depend only on the position of the

pulses (periods of current flow) to the X-stepping

wipers for their operation. The spring position shown

magnet. Each time the magnet operates, the wipers

in figure 6-30 is the normal position. These springs

advance one step in the X direction. The Y-stepping

are used by the associated circuitry to perform various

Figure 6-30.--XY universal switch, schematic diagram.

Figure 6-31.--XY switch and cell banks.

6-36