Data exchange is unidirectional in protocol mode D and permits readout only. The information flows from the tariff device to the HHU. Data transmission is initiated, for example by operating a push button or other sensor on the tariff device.
The protocol mode used by the tariff device is indicated to the HHU by the identification message. Protocol modes A to D are identified by the baud rate identification character ,while protocol mode E is identified by an escape sequence.
Protocol mode B (with baud rate changeover, without acknowledgement/option select message)
Protocol mode C and protocol mode E (with baud rate changeover, with acknowledgement / option select message or other protocols)
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