15
【4】 [Enter] Confirm button
【5】 [TEST] Start test button
【6】 Operation Auxiliary Button (Soft Key) Group
S1-S6 are located to the right of the LCD; they are used for auxiliary operations/settings.
【7】 [Reset] System reset button, which works the same as warm start
【8】 [Save] Save file button
【9】 [Shift] Switch button function button