This is a slave screen of the main Digitizer Control screen. The currently selected Digitizer/Fpga (and hence Detector/Crystal/Segment) is shown. This can only be changed from the main Digitizer Control screen. If you do this then return here and Reload the window. Most of the (large) number of settings accessible via this screen are for diagnostic purposes. Only a few can be written and then be VERY carefully - your experiment can be seriously damaged. Each setting is written to the hardware as it is changed.