A switch monitoring system is provides information on sensor readings and contact closures over a one-wire network or a loop.
대표청구항▼
1. A master-slave signaling system, comprising: a master device including a master loop interface with high-side and low-side interface port, anda master current-signaling loop driver connected to one of the high or the low interface port;a single-wire signaling loop connected to the loop interface,
1. A master-slave signaling system, comprising: a master device including a master loop interface with high-side and low-side interface port, anda master current-signaling loop driver connected to one of the high or the low interface port;a single-wire signaling loop connected to the loop interface, routed from the high to the low interface port; andmultiple slave devices, each connected through a slave loop interface serially along the signaling loop, each to capture slave condition information representing a condition monitored by the slave device, andeach including slave current-signaling circuitry to transmit current-signaling pulses out of the slave loop interface over the signaling loop;the master and slave devices to communicate over the signaling loop according to a loop signaling protocol, including the master current-signaling loop driver to drive onto the signaling loop pre-defined protocol voltages, including a pre-defined loop voltage,to initiate sync events by driving onto the signaling loop a sync-event voltage, followed by returning the loop to the loop voltage,to detect current-signaling pulses received from the signaling loop;each slave device to respond to a sync event by: accessing loop control according to a pre-defined collision avoidance protocol;outputting from the slave current-signaling circuitry through the slave loop interface to the signaling loop, current signaling pulses corresponding to captured slave condition information. 2. The system of claim 1, each slave device comprising one of: a switch detector device to capture switch condition information; anda sensor device to capture sensed condition information. 3. The system of claim 2, each switch detector device having one of a 2-pin interface, or 3-pin interface with an external ground connection. 4. The system of claim 1, the master device including high-side and low-side master current-signaling loop drivers, connected respectively to the high-side and low-side interface ports. 5. The system of claim 4, wherein: the high-side and low-side master current-signaling loop drivers to detect an open fault condition based on implement a loop integrity protocol in which: a first of the master current-signaling loop drivers is operable as a load; anda second of the master current-signaling loop drivers is operable to drive a loop-integrity voltage onto the loop, andto detect whether an open fault condition of the loop is present based on detecting the first master current-signaling loop driver as a load. 6. The system of claim 5, wherein the loop integrity protocol further includes detecting a leakage condition representative of a partial short fault condition. 7. The system of claim 5, wherein when the loop integrity protocol does not detect an open fault condition, the master device is operable to tri-state one of the master current-signaling loop drivers, andto cause the other master current-signaling loop driver to implement the loop signaling protocol; andwhen the loop integrity protocol detects an open fault condition, the master device is operable to cause the high-side and the low-side master current-signaling loop drivers to drive and monitor a section of the loop between a respective interface port and the open fault condition. 8. The system of claim 1, wherein at least one of the slave devices operable to output onto the signaling loop an interrupt current pulse signal not in response to a sync event; andthe master current signaling loop driver to initiate a sync event in response to the interrupt current pulse signal. 9. A master device for use in a wireline communication system including a single-wire signaling loop and multiple slave devices each connected serially along the signaling loop, and each to capture slave condition information representing a condition monitored by the slave device, and each to transmit current-signaling pulses over the signaling loop, the master device comprising: a loop interface with high-side and low-side interface ports that can be coupled to the single-wire signaling loop, routed from the high to the low interface port; anda master current-signaling loop driver connected to one of the high or the low interface port;the master device implementing a loop signaling protocol, including to cause the master current-signaling loop driver: to drive onto the signaling loop pre-defined protocol voltages, including a pre-defined loop voltage,to initiate sync events by driving onto the signaling loop a sync-event voltage, followed by returning the loop to the loop voltage,to detect current-signaling pulses corresponding to captured slave condition information received from the signaling loop through the loop interface high-side and low-side interface ports. 10. The device of claim 9, each slave device comprising one of: a switch detector device to capture switch condition information, and having one of a 2-pin interface, or a 3-pin interface with an external ground connection; anda sensor device to capture sensed condition information. 11. The device of claim 9, the master device including high-side and low-side master current-signaling loop drivers, connected respectively to the high-side and low-side interface ports. 12. The device of claim 11, wherein: the high-side and low-side master current-signaling loop drivers to detect an open fault condition based on implement a loop integrity protocol in which: a first of the master current-signaling loop drivers is operable as a load; anda second of the master current-signaling loop drivers is operable to drive a loop-integrity voltage onto the loop, andto detect whether an open fault condition of the loop is present based on detecting the first master current-signaling loop driver as a load. 13. The device of claim 12, wherein the loop integrity protocol further includes detecting a leakage condition representative of a partial short fault condition. 14. The device of claim 12, wherein when the loop integrity protocol does not detect an open fault condition, the master device is operable to tri-state one of the master current-signaling loop drivers, andto cause the other master current-signaling loop driver to implement the loop signaling protocol; andwhen the loop integrity protocol detects an open fault condition, the master device is operable to cause the high-side and the low-side master current-signaling loop drivers to drive and monitor a section of the loop between a respective interface port and the open fault condition. 15. The device of claim 9, wherein at least one of the slave devices operable to output onto the signaling loop an interrupt current pulse signal not in response to a sync event; andthe master current signaling loop driver to initiate a sync event in response to the interrupt current pulse signal. 16. A slave device for use in a wireline communication system including a master device coupled to a single-wire signaling loop at high-side and low-side interface ports, and to multiple slave devices each connected serially along the signaling loop, each slave device comprising: a slave loop interface connected to the signaling loop;detector circuitry to capture slave condition information representing a condition monitored by the slave device; andslave current-signaling circuitry coupled to the slave loop interface, to detect sync events initiated by the master device by driving onto the signaling loop a sync-event voltage, followed by returning the loop to a loop voltage,to arbitrate for loop control according to a pre-defined collision avoidance protocol,to transmit current-signaling pulses out of the slave loop interface over the signaling loop, the current-signaling pulses corresponding to captured slave condition information. 17. The device of claim 16, each slave device comprising one of: a switch detector device to capture switch condition information; anda sensor device to capture sensed condition information. 18. The device of claim 17, each switch detector device having one of a 2-pin interface, or 3-pin interface with an external ground connection. 19. The device of claim 16, wherein at least one of the slave devices operable to output onto the signaling loop an interrupt current pulse signal not in response to a sync event; andthe master current signaling loop driver to initiate a sync event in response to the interrupt current pulse signal.
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이 특허에 인용된 특허 (5)
Nitschke,Werner; Meier,Klaus Dieter; Balzer,Knut; Mauritz,Ewald; Buehring,Heiko; Bogenrieder,Hans; Pfaffeneder,Bernd; Wulff,H��lger, Bus master for a bus for connection of sensors and/or ignition means.
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