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

Introduced: September 1968

IPC and CPC are identically structured here. All 5 subcodes exist in both systems.

Child Classifications

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H04Q 9/02 Automatically-operated arrangements IPC+CPC Available in IPC and CPC
H04Q 9/04 Arrangements for synchronous operation IPC+CPC Available in IPC and CPC
H04Q 9/06 Calling by using amplitude or polarity of DC IPC+CPC Available in IPC and CPC
H04Q 9/08 Calling by using continuous AC IPC+CPC Available in IPC and CPC
H04Q 9/14 Calling by using pulses IPC+CPC Available in IPC and CPC