Operating via Buttons and Encoder The menu is operated with the encoder. The menu option is selected by turning the encoder anticlockwise, and then confirmed by pressing. A pop-up window is provided for changing numerical values. They are accepted by pressing the encoder. The process can be cancelled by pressing START/STOP. - Switches the venting valve on if the control is inactive. - Opens the venting valve as long as the button remains pressed while control is active. - Starts "ultimate pressure" mode directly. - Starts the operating mode currently selected in the main menu and the corresponding set value. - Starts the operating mode manually with the currently selected setpoint in the solvent table, see chapter 6.9. - Stops the active mode - Cancels the input in the pop-up window. - Jumps back to the main menu from submenus.