4.2 The flow of data and memory behaviour Data handling
4 - 4
© Siemens VDO Automotive AG Edition 07/2007
TD00.1381.00 132 102
4.2 The flow of data and memory behaviour
Fig. 4 - 1: The flow of data and memory behaviour, schematic diagram
4.2.1 Working memory
The working memory is used for temporary intermediate storage of
all recorded and processed data.
The following procedures are processed in the working memory:
• Preparation and transferring of all recorded and legally stipu-
lated data for archiving in the data memory.
• Preparation and outputting of the requested data over the
display, download interface, or printer.
• Saving of data that is read in from an inserted tachograph card
for the time period of usage.
• Transfer of the updated data to the tachograph card and
deletion of the data from the working memory (when requested
by a tachograph card).
Tachograph cards
Display
Printer
Download
Working memory
• Recording and
processing of the
distance pulses
• Saving of card data
• ...
interface
Data memory for 365
days
• Driver activities
• Instances of vehicle
deployment
• Speed min. of the last
24 h
•...
• Buffer for v-recording
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