Siemens VDO DTCO 1381, Technical Description

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Service only
Appendix 14.1 Operating conditions of the DTCO 1381
Edition 07/2007 Technical Description DTCO 1381
14 - 7
TD00.1381.00 13
2 102
If the supply voltage of the DTCO 1381 drops further below the reset
threshold (5,3 - 5,5 V), the DTCO 1381 switches off.
As soon as the supply voltage of the DTCO 1381 rises once more
above the limit value (6,0 - 7,2 V), the DTCO 1381 runs a restart pro-
cedure. The version of the user software appears for approximately
5 seconds and then the DTCO 1381 indicates "power interruption".
14.1.5 Emergency run after self-test
The DTCO 1381 monitors the correct functioning of the operating
software; if a fault occurs, the DTCO 1381 carries out a restart to
eliminate the fault.
The operating software version appears for approximately five
seconds. After the fault has been successfully eliminated the
DTCO 1381 returns to the normal operating mode.
If, after a number of attempts, the DTCO 1381 is unable to eliminate
the fault, it switches to the operating mode "emergency run".
The following functions are not available:
• The driver's activities will not be recorded.
• The speed is not indicated.
• The backlighting of the display is switched off.
• All buttons are deactivated.
• All external interfaces are deactivated (except the v-pulse
outputs, the 4 pulses/m signal output and conditionally the CAN
interface).
• Printing or display of data is not possible.
• Insertion or removal of the tachograph cards is not possible.
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In the "emergency run" mode the DTCO 1381 cannot fulfil its
function as EC recording equipment!