Ph.D. - geht es zur Homepage der Informatik des Fachbereiches 3 ...
Ph.D. - geht es zur Homepage der Informatik des Fachbereiches 3 ...
Ph.D. - geht es zur Homepage der Informatik des Fachbereiches 3 ...
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Chapter 10. openETCS Model<br />
The purpose of th<strong>es</strong>e graphs is to define how data is extracted for incoming telegrams (see<br />
Subsection 7.3.5) but not to define the structure of telegrams. This is done in the graph<br />
instanc<strong>es</strong> for the ETCS language in the upcoming Section 10.4.<br />
It should be noted that the model of the openETCS case study do<strong>es</strong> not contain any<br />
gCommunicationSen<strong>der</strong> graphs because the selected subset of the specification or rather the<br />
sub-subset of Subset-026 (of the SRS) do<strong>es</strong> not include sending from train to track-side<br />
functionality.<br />
10.3.1. Level Transition Or<strong>der</strong> Reading<br />
The graph for reading a telegram with a level transition or<strong>der</strong> [85, p. 14] is used in most Mod<strong>es</strong><br />
for moving the train: Unfitted, Staff R<strong>es</strong>ponsible, and Full Supervision. The corr<strong>es</strong>ponding<br />
model is displayed in Figure 10.25.<br />
D_LEVEL_TR_T:<br />
D_LEVLTR<br />
bit<br />
LevelTransition D_LEVEL_TR<br />
BALISE<br />
READER<br />
TELEGRA<br />
telegram<br />
BaliseTelegram Level Transition Or<strong>der</strong><br />
Iterator Variable<br />
M_LEVELTR_T:<br />
M_LEVELTR<br />
bit<br />
LevelTransition M_LEVELTR<br />
L_ACKLEVELTR_T:<br />
L_ACKLEVELTR<br />
bit<br />
LevelTransition L_ACKLEVELTR<br />
Figure 10.25.: Reading of a level transition or<strong>der</strong> as gCommunicationRea<strong>der</strong> graph<br />
The currently used data in the case study are the following information:<br />
1. the Application Level to be switched to (“M_LEVELTR”)<br />
2. the distance to the point where the transition tak<strong>es</strong> place (“D_LEVELTR)<br />
3. the distance to the point until the driver has to acknowledge the transition (”L_ACK-<br />
LEVELTR“)<br />
10.3.2. National Valu<strong>es</strong> Reading<br />
This graph d<strong>es</strong>crib<strong>es</strong> the reading of national valu<strong>es</strong>, which is part of most ETCS Mod<strong>es</strong> in<br />
Application Level 1. Its model is shown in Figure 10.26. The meaning of each value can be<br />
found in [85, pp. 31-62].<br />
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