It’s thermistor
inputs, split into 4 quadrants, enters via it’s front panel.There are 10 (10) channel control
boards in this unit, along with a Xilinx zero card.All the unit’s power supplies are
house in here.The indicator
LEDs on the front panel light when the desired length change is
acquired.The output signals
are routed out the rear of the Unit and connect to their respective Driver
Units.