Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Child Classifications

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• H04Q 9/02 Automatically-operated arrangements
• H04Q 9/04 Arrangements for synchronous operation
• H04Q 9/06 Calling by using amplitude or polarity of DC
• H04Q 9/08 Calling by using continuous AC
• H04Q 9/14 Calling by using pulses