Siemens VDO DTCO 1381, Technical Description

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Service only
1.1 System overview Product and system overview
1 - 4
© Siemens VDO Automotive AG Edition 07/2007
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1.1.1 Brief description
DTCO 1381 The DTCO 1381 digital tachograph is an EC recording equipment
that complies with the requirements of CR (EEC) 3821/85, annex I B.
It is used to register, save, display, print, and output driver-based and
vehicle-based data. The data is saved in the DTCO 1381 device
memory and on inserted tachograph cards.
The standard display provides an overview that shows the time,
current speed, and distance. It also shows the set activities and
symbols of the inserted tachograph cards, see chapter 3.2 "Display
variations", page 3-5.
An internal diagnosis function monitors the system and automati-
cally notifies if events or faults appear.
Events, faults, or warning messages are displayed optically.
KITAS 2171 KITAS 2171 is part of the EC recording equipment, it provides real-
time signals and cryptologically encoded data. The signals serve for
recording the distance and speed.
The DTCO 1381 can detect external interferences and influences by
monitoring the data communication with the KITAS 2171 and com-
paring this to the real-time signal.
Printouts The integrated printer on the DTCO 1381 can print data from the
memory and the tachograph cards. The types of printout, the
format, arrangement, and data contents are defined in CR (EEC)
3821/85, annex I B.
Printer paper The printer paper is approved for use with the DTCO 1381 and
exhibits a corresponding mark of approval. The paper is a special
thermal printing paper.
Display instrument A display instrument is located directly in the driver’s field of vision.
The operational check "
" (shown in the color amber or orange)
brings attention to messages from the DTCO 1381.
The display instrument is not part of the EC recording equipment.
Display instruments are designed for specific vehicles and will not be
covered in this documentation.