Method and system for transmitting signals using frequency hopping
First Claim
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1. A system for transmitting signals on a plurality of transmission channels, the system comprising:
- a master unit configured to detect a vacant channel among a plurality of transmission channels and to transmit a signal on the vacant channel; and
at least one slave unit configured to scan the channels for the transmitted signal, the signal transmitted by the master unit defining a preamble having a length corresponding at least to the time required for the at least one slave unit to test the channels for the transmitted signal, the preamble having a predefined characteristic with system specific information indicating to the slave unit that the transmitted signal is a message originating from a master unit related to the same system,wherein the at least one slave unit is further configured to, when having detected the predefined characteristic, interrupt the scanning and test the message received via said channel for an address, andwherein said at least one slave unit further is configured to acknowledge receipt of the correctly addressed signal by transmitting a response signal to the master unit via said channel.
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Abstract
Method of and system for transmitting signals, e.g. control signals, request signals, interrogation signals etc. in a control system comprising at least two units, wherein at least one of said units is designed to operate as a master unit and wherein at least one of said units is designed to operate as a slave unit, whereby a plurality of channels may be used for the transmission, whereby a first unit performs the steps of detecting a vacant channel and transmitting a signal via said vacant channel, and whereby at least one other unit performs the step of scanning the channels for transmitted signals.
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Citations
25 Claims
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1. A system for transmitting signals on a plurality of transmission channels, the system comprising:
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a master unit configured to detect a vacant channel among a plurality of transmission channels and to transmit a signal on the vacant channel; and at least one slave unit configured to scan the channels for the transmitted signal, the signal transmitted by the master unit defining a preamble having a length corresponding at least to the time required for the at least one slave unit to test the channels for the transmitted signal, the preamble having a predefined characteristic with system specific information indicating to the slave unit that the transmitted signal is a message originating from a master unit related to the same system, wherein the at least one slave unit is further configured to, when having detected the predefined characteristic, interrupt the scanning and test the message received via said channel for an address, and wherein said at least one slave unit further is configured to acknowledge receipt of the correctly addressed signal by transmitting a response signal to the master unit via said channel. - View Dependent Claims (2, 3, 4)
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5. A method of transmitting signals in a control system having at least two units operating on a plurality of transmission channels, one of the units operating as a master unit and the other of the units operating as a slave unit, the method comprising the steps of:
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detecting a vacant channel among a plurality of transmission channels by a master unit; transmitting a signal by the master unit via the vacant channel; scanning the transmission channels by a slave unit for a transmitted signal; detecting the transmitted signal on the vacant channel by the slave unit, the transmitted signal having a preamble with a length corresponding at least to a period of time required for the slave unit to test the transmission channels; testing the preamble by the slave unit for a predefined system specific characteristic to indicate to the slave unit that the transmitted signal originates from a master unit related to the same control system; interrupting the scanning step when the slave unit detects the predefined system specific characteristic in the preamble of a received message; testing the message received via said channel for an address; and acknowledging receipt of the correctly addressed signal by transmitting a response signal to the master unit via said channel. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A control system for transmitting signals, comprising:
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a system master unit for detecting a vacant channel among transmission channels, the system master unit configured for transmitting a signal on the detected vacant channel; and a system slave unit configured for electronic recognition of a plurality of master units including the system master unit, the system slave unit further configured for electronic communication with the system master unit, wherein the system slave unit is configured for scanning the transmission channels for a transmitted signal from the plurality of master units including the system master unit, the system slave unit further configured to test a preamble of the transmitted signal for a predefined system specific characteristic to indicate to the system slave unit that the transmitted signal originates from the system master unit, the preamble having a length corresponding at least to a period of time required for the system slave unit to test the transmission channels; wherein the system slave unit is further configured to, when having detected the predefined characteristic, interrupt the scanning and test the message received via said channel for an address, and wherein the system slave unit further is configured to acknowledge receipt of the correctly addressed signal by transmitting a response signal to the system master unit via said channel. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification