Logical control system consists of channel modules each of which provides 16 (32) digital channelizing. Each digital channel may serve as the stimulator of digital signal levels (to work for transmission), digital signal levels’ analyzer (to work for reception).Work synchronization is provided by one of channel modules which are set as synchronizing.

Switching system consists of relay switching modules, which provide an automatic connection of power sources; common wire (of “Earth”) for one or group up to 64 edge connector contacts each and channel switching modules which provide digital channels’ cutoff from edge connector contacts of unit under test to which supply voltages or analog input signals are sent.