Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1987-11-23
1990-02-06
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340505, 340310R, 34082506, 340531, 340508, G08B 2600
Patent
active
048991317
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a local control system for machines, apparatus, alarms, sensors and similar system loads in a home.
The primary object of the invention is to provide a local system of the kind indicated which permits one or two-way communication between a central unit and peripheral units connected to the central unit by a two-wire bus line. In one-way communication, for example, a range or a washing machine connected to the system can automatically be switched on or off. In two-way communication an alarm loop can be connected by a control signal transmitted from the central unit and the change in the current level on the bus caused by the connection of the loop gives a current response which constitutes a message from the peripheral unit to the central unit.
DESCRIPTION OF RELATED ART
A local system of the kind indicated is known from the published International Patent Application WO-81/02962. In this system the central unit comprises means for generating control signals which consists of a repetitive series of signal frames, each frame including a reset pulse and a plurality of other pulses. The central unit includes control means which causes selectable alteration of a characteristic of said other pulses. Each of said peripherial units is addressed following receipt of a respective predetermined number of said other pulses, said pheripheral units being responsive to said selectable characteristic of the other pulses whereby control instructions are transmitted to address peripheral units in accordance with operation of said control means. Data and address information are contained within the same other pulse.
According to the system described above all peripheral units are addressed in a predetermined order and reset pulse is required to reset counters and the like in the perpheral units.
SUMMARY OF THE INVENTION
A draw-back in the system described is that a selected peripheral unit cannot be addressed directly but only following the predetermined order. The system of the present invention differs from the system described above in that addressing is performed by a pulse train starting with an address part to which a data part is connected which may contain an instruction. Such an arrangement belongs to the prior art and starting from this arrangement a special object of the invention is to permit under certain circumstances a peripheral unit to receive a signal and to transmit part of it to an additional local system connected to the said peripheral unit or to a manual control unit connected to the system of which said perpheral unit is part.
BRIEF FIGURE DESCRIPTION
The invention will now be described more in detail in connection with the appended drawings.
In FIG. 1 a block diagram is shown of a local system.
FIG. 2 shows a block diagram of a current measuring device and
FIG. 3 is a graph relating to the block diagram of FIG. 2.
FIGS. 4 and 5 are examples of various system loads connected to the system via coupling devices called terminal units.
FIG. 6 is a block diagram of a terminal unit.
FIG. 7 is a circuit diagram for a manual control unit interconnected with a terminal unit, and
FIG. 8 is a graph relating to the circuit diagram of FIG. 7.
DETAILED DISCLOSURE OF THE INVENTION
As appearing in FIG. 1 the local system consists of two main parts, the central unit 10 and a plurality of system loads 11 (only one of which is shown). The system loads are connected to the system via so-called terminal units 12, which are constituted of a standardized coupling device admitting the selective connection and disconnection of a system load. A two-wire bus line 13 interconnects the terminal units with the central unit.
The central unit includes a microprocessor or CPU 14 and a memory unit 15. The CPU is the brain of the system which controls the power supply of the bus line 13 via a drive unit 16. Via the drive unit, also, control signals are sent to the terminal units 12 for connecting or disconnecting of the respective system load. A current measuremen
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patent: 4658243 (1987-04-01), Kimura et al.
Olsson John G.
Wilk Sven T.
Aktiebologet Electrolux
Crosland Donnie L.
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