- -254.3.1 Print IntervalTo set the Print Interval, proceed as follows:1. Use the arrows ▲▼ to select the item;2. Press ENTER: You will get the following message:COMMUNICATION MENUSERIALPRINT INTERVALh:mm:ss (1h max)0:00:00▼▲ set exit confirm3. Use the arrows ▼▲ to set the value;4. Press ENTER to confirm and return to the previous page, or press ESC to cancel the change andexit the menu item;5. Press ESC over and over to exit from the submenus;6. Press MENU to exit immediately from the main menu.The print interval can be set from 0 seconds to one hour:0 s - 15 s - 30 s - 1 min. - 2 min. - 5 min. - 15 min. - 20 min. - 30 min. - 1 hour.4.4 SETTINGSTo enter the Settings submenu, proceed as follows:1. press the instrument MENU key;2. Use the arrows ▼▲ to select Settings3. press ENTER: the following message appears:SETTINGS1)Contrast2)Backlight▼▲ select exit/cancel confirmThis menu item allows to:1. Increase or decrease the display contrast.2. Set the ON time of the display backlight.