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| Security system for a building complex having multiple units |
| FIG. 1 is a functional block diagram of a security system 10 for use in a building complex having ... |
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| Reduced power supervisory message transmission in a wireless alarm system |
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| Inexpensive modulated backscatter reflector |
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| Communications systems and methods |
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Security and alarm system
| Details |
Inventors: Gerhart, Roland T.; Hill, J. Carroll;
Assignee:
Primary Examiner: Crosland; Donnie L.
Assistant Examiner:
Attorney, Agent or Firm: Flynn, Thiel, Boutell, & Tanis
A method and apparatus are provided for transmitting from a radio transmitter which is part of a first system to a radio receiver which is part of a second system a message which includes a plurality of characters arranged in a predetermined sequence. Each character of the message is transmitted in the form of a 48-bit binary word, the first byte of the word being a start byte, the second and third bytes being identical binary numbers representing the position in the message of a selected one of the characters, the fourth and fifth bytes being identical binary numbers which are the ASCII code corresponding to the selected character, and the sixth byte being a stop byte which is a predetermined binary number different from the start byte. |
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DETAILED DESCRIPTION The objects and purposes of the invention are met by providing a method and apparatus for transmitting from a radio transmitter to a radio receiver a message which includes a plurality of characters arranged in a predetermined sequence.
Each character of the message is transmitted in the form of a 48-bit binary word, which is made up of six 8-bit binary words.
The first 8-bit binary word is a predetermined binary number, the second and third 8-bit binary words are identical and are a binary number representing the position in the message of a selected one of the characters, the fourth and fifth 8-bit binary words are identical and are a binary number representing the selected character, and the sixth 8-bit binary word is a predetermined binary number different from that of the first 8-bit binary word.
In a preferred form of the invention, the bits of the first 8-bit binary word are all binary 0's, and the bits of the sixth 8-bit binary word are all binary 1's.
The binary number representing the selected character is the ASCII code representing the selected character.
The characters of the message are preferably sent successively and the message is preferably sent repeatedly, so that in effect the transmitter is transmitting a continuous string of binary bits at a first rate.
The receiver continuously accepts binary bits at a rate slightly different than the rate at which the transmitter transmits, and the receiver continuously evaluates the 48 bits most recently received in order to determine whether the bit pattern thereof corresponds to a valid transmission.
A system embodying the present invention can provide security from theft, fire, and personal injury to the occupants of a dwelling, an industrial building, or other semi-enclosed space.
The system can signal the presence of alarm conditions to nearby neighbors via a radio link utilizing readily available and inexpensive citizens band transceivers.
With suitable battery back-up capability installed, the system can maintain communication with neighboring systems even if all telephone and power lines to the protected building have been severed
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