Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-09-12
1989-07-04
Yusko, Donald J.
Communications: electrical
Condition responsive indicating system
Specific condition
340623, 340625, 379106, G08B 2100
Patent
active
048454869
ABSTRACT:
An automatic reorder and alarm system for use with residential fuel-oil tanks which sends reorder and alarm data to a central station over the direct-dial telephone network when the fuel-oil level in the tank falls below a predetermined value or when an alarm situation, such as low temperature, occurs at the tank location. An inexpensive sensor/sending unit located at each customer tank includes a simple sensor which mounts on either the tank or an existing fuel-oil level gauge, a microcontroller circuit and a modem circuit. The microcontroller circuit uses a simple low-stability oscillator as a reference for internal operations and for modem transmission frequencies. Because the oscillator frequency cannot be precisely determined due to component tolerances and has a substantial amount of drift, a special data transmission format is used for data transmission over the telephone lines between the microcontroller and the central station. The data format consists of a selected pattern of mark and space signals in which each mark signal consists of a predetermined number of cycles of an oscillating signal whose frequency is determined by the internal modem oscillator and each space signal is an equivalent time period without a signal. At the receiver the bit time duration is determined by averaging bit times in a predetermined bit pattern header.
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Mesures. Regulation Automatisme, No. 1, Jan. 1982, pp. 7-10, 12, Paris, FR.
Banks Frank H.
DeFrancesco Robert A.
Knight John D.
Mitchell Andrew
Shapiro Robert D.
Queen Tyrone
Scully Robert
Yusko Donald J.
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