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21January2021/Version 0
LEM International SA
Chemin des Aulx 8
1228 PLAN-LES-OUATES Switzerland
www.lem.com
6.2. General display concepts
The display of the DCBM primarily aims at
displaying data relevant to certified billing.
Screens are sequenced accordingly. The
display also provides data which can be useful
for installation and maintenance.
The screens are sequenced according to the
adjacent block-diagram.
Those states are described individually in below
sections.
Figure 33: Global state machine of the display
Two buttons are present on the front panel. Their effect depends on the current state and is
described along with states. Those buttons are referred to as follows:
Figure 34: Identification of buttons
D
ue to certification function of the display, a visual distinction appears between certification data
and user experience-oriented data. This distinction is illustrated on example of screen below.
Figure 35: Visual distinction for legal relevance on the display
Boot
screens
Idle
Maintenance
state
Timeout
or Buttons
Transaction
screens
A
B
Identification
on figure
Naming in hereby
document
A
Top button
B
Bottom button
i
Legally non-
relevant lines
On inverted dark
background
Legally
relevant lines
On regular light
background
