There are 2 offsets for the Core ADC card and 7 for each of the 6 Segment ADC cards.

On the Core ADC card the two channels can be enabled to transmit Time Over Threshold data over the optical link to the Pre-Processing.

Just move the slider using the mouse to select the value required and when you release the mouse button the value will be written to the digitizer hardware. The Offset values shown are obtained by reading the current settings from the hardware. 

"Re-Write Current FPGA OFfsets"
  The Offsets displayed will be written back to the hardware. 

You can "Save" and/or "Restore" the offsets for the current Digitizer (or Detector/Crystal) from the digitizer settings database. Note that these functions act on all 44 offsets within the selected digitizer.