9
Workshop Manual
Smart Tachograph EFAS-4.10/4.11
4.4 Display
The EFAS tachograph has an alphanumeric monochrome graphics-capable LCD. The color of the back-lighting is a device option
and is set at the factory. It cannot be altered subsequently.
Figure 3 — Alphanumeric display
Text is displayed in the local language as congured. The language is set based on the local language of the driver’s or workshop
smart-card or it can be selected via the main menu.
4.5 Warning light and acoustic signals
The red warning light displays various operating states of the EFAS tachograph. In the default conguration, certain operating
states are indicated with an acoustic signal. If required, the acoustic signals can be enabled or disabled in the menu or alter-
natively as a parameter setting via the service interface. The settings for acoustic signaling are made in the device menu or
alternatively as a parameter specication via the programming interface. Besides the tachograph’s acustic signals, the alarm is
in some cases triggered on the alarm output pin D4 of the D connector panel. The Output pin D4 is not available for all device
variants (see section: Connector panel). The alarm output can be used to activate an external alarm display e.g. a warning light
on the instrument panel or in the tachometer display.
Figure 4 — Red warning lights to display the operational status
The table below summarizes the various operating states of the warning light and their meanings:
Table 1 — Warning light and acoustic signals
LED Tone/series of tones Meaning / Operating state
Function check
O - Ready for operation and no active alarms (device is activated or in standby mode).
Blinks RED 1x - The LED blinks briey as a function check when the tachograph is switched on.
- 3x long The connection to the front module is faulty. LCD display is faulty or not possible.
Blinks RED - The LED blinks briey with long breaks in between. There is a serious defect with
the hardware. The LCD display remains dark after the device is switched on. The
tachograph must be replaced.
Alarms
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