The filter currently on axis is displayed in the TCS window filter position. If you open the west door to the topbox, the filter two before the on-axis filter should be visible. So, if you select the first filter, filter 3 should show thru the open door. If this does not happen, exit the Realtime System, and then restart the Realtime system. If UPS power is lost during a run, exit the Realtime System AND reset the guider, cycle the power to the controllers, and restart Realtime System.
Lower numbers mean the mirror moves toward the primary.
The size of the movement can be changed with the Focus Set button. The default step of 20 corresponds to the smallest significant change in the mirror position when binned by two with the ccd. The current focus position is displayed in the main TCS info window. After focusing the telescope, be sure to check the on-axis focus for the guide camera. The default on-axis value may need to be changed.