Off-hook detector for automatic meter reading equipment

Details Off-hook detector for automatic meter reading equipment Off-hook detector for automatic meter reading equipment

H - Electricity

04

M

H04M 11/06 (2006.01) H04M 1/82 (2006.01)

Patent

CA 2124104

-8- Abstract of the Disclosure An off-hook detection circuit (10) utilizes a low- level current loop when an automatic meter reading unit is operating over a telephone line to detect a phone receiver being taken off-hook. Lifting the phone receiver changes the loop current (IL) which is detected and converted to a suitable voltage input (Vout) to a microprocessor, which then disables the meter reading operation until the phone receiver is returned to its hook.

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