Pangolin Laser Systems FB4 quick start guidePage 6 of 10User interfaceTo modify settings and change operating modes, the control knob can be used inconjunction with the OLED display.Activating the displayPress the knob once to activate the display.The bar on the top displays the current operation mode of FB4. The white arrow can bemoved between menu items by rotating the knob. Pushing the knob will activate the menuitem next to the arrow.The items displayed in the menu may vary between different operation modes and whendifferent accessory boards are connected to FB4.