Table 1 Structure of the data packet used by the infrastructure to send commands to GSPA
From: Pervasive multimedia guidance system for special needs passengers on public transport
Field name | Length (bytes) | Description |
|---|---|---|
FS | 1 | Frame start: fixed value 0 × FF |
CM | 1 | Command: |
0 × 01: Infrastructure out of service | ||
0 × 02: The system tries to recover from a failed state | ||
0 × 03: The vehicle is not in service | ||
0 × 04: Start of a route | ||
0 × 05: Route point description | ||
0 × 06: The vehicle is in a bus stop | ||
0 × 07: The vehicle is in a state of operative pause | ||
0 × 08: Infrastructure halt | ||
LDA | 1 | Length of the following field (DT field) |
DT | Variable | Data field whose configuration depends on the command (CM field) |
CHK | 1 | Checksum value |