AISY operates on the basis of RF (Radio Frequency) data exchange between a vehicle and a loop on the ground.

  1. 1. The ground loop continuously generates an RF carrier in the range of 10 kHz.

  2. 2. When a vehicle passes over the loop, the 10 kHz carrier is detected, and the vehicle returns data using FSK (Frequency Shift Coding) signals in the range of 3600 – 4800 Hz.

  3. 3. At the ground level, the data decoded and transmitted to local control equipment using either floating contacts, or dedicated communication protocol through a serial communication line.

  4. 4. If the equipment includes inductive detection, the carrier is mixed with a signal in the range of 100 kHz, typical for such magnetic detection.

The transmitted data can include several information, such as:

  1. Opsommingsteken Dashboard controls for railroad switch (left, right, straight)

  2. Opsommingsteken Priority call, vehicle length

  3. Opsommingsteken Vehicle identification number

  4. Opsommingsteken Vehicle trip identification

  5. Opsommingsteken Vehicle follow up identification

  6. Opsommingsteken  …

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