Duplex bi-directional multi-mode remote instrument reading...

G - Physics – 08 – C

Patent

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G08C 17/02 (2006.01) G01D 4/00 (2006.01) H04Q 9/10 (2006.01)

Patent

CA 2164220

The remote instrument reading and telemetry sys- tem includes at least one instrument link (2) intercon- nected to a data gathering device (4) and a remote station interrogation apparatus (6). The interrogation apparatus (6) and instrument link (2) both include ra- dio transmitters (30) and receivers (44). The interro- gation apparatus (6) instructs the instrument link (2) to transmit information, within certain time frames, and in a specific frequency channel. Before requesting the transmission of information, the interrogation appara- tus (6) determines the best available reply channel for transmission of information. The instrument link (2) transmits information using spread spectrum modula- tion techniques.

Le système de lecture d'instruments à distance et de télémétrie comprend au moins une connexion d'instrument (2) interconnectée avec un dispositif de collecte de données (4) et un appareil d'interrogation des postes à distance (6). L'appareil d'interrogation (6) comprend à la fois des émetteurs (30) et des récepteurs (44) radio. L'appareil d'interrogation (6) ordonne à la connexion d'instrument (2) d'émettre des informations pendant certains intervalles de temps et sur un canal de fréquence spécifique. Avant de demander la transmission des informations, l'appareil d'interrogation (6) détermine le meilleur canal de réponse disponible à cette fin. La connexion d'instrument (2) émet les informations grâce à des techniques de modulation à spectre dispersé.

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