Roymondo:
tachograph:
On a VDO tachograph when the vehicle is stationary press OK and the following screen will be displayed.
- Top left is the accumulated driving time since the last 45 minute break.
- Bottom left is the accumulated driving time in the 2 week period.
- Bottom right is the length of the current break.
- Top right shows the accumulated break since the last 45 minute break.
Surely if you press OK it goes into the standard menus for printouts etc? I always press the down-arrow to call up the driving time etc display shown (on vehicles which don’t have this piped through to the dash display).
My bad, you’re absolutely right when stationary you press the down button not the OK button and thanks for pointing it out 
When the vehicle is moving you can press the OK button to see the driving time and break taken since the last 45 minute break.