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PCE
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DIFF Subgroup
H04Q 9/08

Calling by using continuous AC

Introduced: September 1968

Full Title

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 > Calling by using continuous AC

IPC and CPC are identically structured here. All 2 subcodes exist in both systems.

Child Classifications

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  • H04Q 9/10 using single different frequencies IPC+CPC Available in IPC and CPC
  • H04Q 9/12 using combinations of frequencies IPC+CPC Available in IPC and CPC