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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
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Industry
CPC
H04Q9/00
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Parent Industries
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ELECTRICITY
H04
Electric communication
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H04Q9/00
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
Sub Industries
H04Q9/02
Automatically-operated arrangements
H04Q9/04
Arrangements for synchronous operation
H04Q9/06
Calling by using amplitude or polarity of dc
H04Q9/08
Calling by using continuous ac
H04Q9/10
using single different frequencies
H04Q9/12
using combinations of frequencies
H04Q9/14
Calling by using pulses
H04Q9/16
by predetermined number of pulses
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