The user interface is an LCD display with 7 buttons. User interface functions are grouped to UI
operating modes described in Section 3.15.
FIG. 10 LCD GLASS LAYOUT
3.10
DISPLAY OPERATION
3.11
SYMBOLS ON THE LCD
The FHE-250 is equipped with an LCD display capable of showing four full 7-segment digits and a
set of additional icons showing information about the current state and operating mode of the device.
Four 7-segment digits and alternatively partially implemented fth digit are used for displaying
numeric values and some letter indication. Total number of LCD segments is 60. Their description
with details and placement are described on Fig. 10 and Fig. 11.
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