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10.4. The ETCS Language
10.4. The ETCS Language
In contrast to all preceding graphs, the language part of the openETCS model describes only
data structures and not behaviour.
10.4.1. Balise Telegram
The modelling of the balise telegram is done in a gTelegram graph. Since it defines the structure
of any possible telegram, it is only one graph instance required for the complete openETCS
model, which is shown in Figure 10.28. The oVariableInstance objects ”Q_UPDOWN“ down
#
M_DUP_T: M_DUP
Q_UPDOWN_T:
Q_UPDOWN
#
M_VERSION_T:
M_VERSION
#
M_MCOUNT_T:
M_MCOUNT
#
NID_C_T: NID_C
#
Q_MEDIA_T: Q_MEDIA
#
#
NID_BG_T: NID_BG
#
N_PIG_T: N_PIG
#
Q_LINK_T: Q_LINK
#
N_TOTAL_T: N_TOTAL
#
Balise Content
#
End of Information
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Figure 10.28.: Balise telegram structure as gTelegram graph
to ”Q_LINK“ are used as header for any type of balise telegram [87, p. 9]. They hold the
general information about the telegram, like the transmission direction (”Q_UPDOWN” [85,
p. 57]), the related ETCS version (“M_VERSION” [85, p. 44]), and the used transmission
media (“Q_MEDIA” [85, p. 52]).
The oAnyPacket object labelled “Balise Content” defines all possible ETCS packets that
may occur after the header. The concrete structure representation as gAnyPacket graph will
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