The radio network for the Winter Train is based on the wireless JeeNode platform. The JeeNode radio network is a simple package based communication system capable of both broard cast and point to point communication.
Due to limitations in the protocol used by the JeeNodes, the package header can only contain one radio “node” ID - either sender or receiver. In order to simplify implementation and debugging, all communication will be done as “broadcast” (which it anyway is). The package header will contain the sender ID. The first byte of the payload will specify the package type, which normally also will indicate the intended destination.
Based on this, any receiver can identify the sender and the content and hence determine, if the receiver should react on the package.
Node group: 101
|10||RBC_COM||Communication link to RBC|
|20||OBU_1||Train 1 - Stainz 2020|
|21||DMI_1||DMI for train 1|
|23||DMI_2||DMI for train 2|
This ID is used to identify the sender of each package.
|20||Poll acknowledgement and operator commands from DMI to OBU||OBU|
|21||Poll of and indication to DMI_1||DMI_1|
|21||Poll of and indication to DMI_2||DMI_2|
|31||Movement Authority for OBU_1||OBU_1|
|32||Movement Authority for OBU_2||OBU_2|
|41||Mode Authority for OBU_1||OBU_1|
|42||Mode Authority for OBU_2||OBU_2|
See enummeration for coding of values.
10, Position Report
Position report from OBU to RBC:
|6,7||int||Actual distance from balise to train, with sign||Distance measured from position of tag reader antenna.|
|9||byte||Status||B0-2: Requested operational mode, B3-4 Nominal driving direction, B5-6: Track polarity, B7: AuthAck|
|10,11||int||Accumulated distance counter|
AuthAck: Acknowledgement for received Movement or Mode Authority
11, Mode request
Mode request from OBU to RBC
20, DMI acknowledgement
Acknowledgement and commands from DMI to OBU:
|1||Byte||Selectors||B0-2: Mode Selector, B3-4: Direction Selector, B5-7: Traction Selector|
21, 22, Poll DMI
Poll and indications from OBU to DMI:
|0||Byte||Package type||21: to DMI_1, 22: to DMI_2|
|1||Byte||MA and error Indication||B0: Green, B1: Yellow, B2: Red, B3: Blue|
31, 32, Movement Authority
MA from RBC to OBU:
|0||byte||Package type||31, 32|
|6,7||int||Distance from balise to EOA, with sign|
Distance = 0
is a special MA, requesting the train to stop and clearing the MA.
41, 42, Mode Authority
Allowed mode, from RBC to OBU on request from OBU:
|0||byte||Package type||41, 42|