초록 ▼

A system for maintaining proper termination and error-free communication in a network bus (12) including a power bus includes at least one network device (18), a network controller (14) and at least on bus protection element. The network devices (18) are electrically connected to and adapted to comm

A system for maintaining proper termination and error-free communication in a network bus (12) including a power bus includes at least one network device (18), a network controller (14) and at least on bus protection element. The network devices (18) are electrically connected to and adapted to communicate via the network bus (12). The network controller (14), in turn, is electrically connected to the network bus (12) and is adapted to direct communications with the network devices (18) via the network bus (12). The network controller (14) is also adapted to provide power signals to the network devices (18) via the power bus of the network bus (12). The network controller (14) and/or the bus protection elements can monitor signals on the network bus (12). And based upon the network controller (14) and/or bus protection elements identifying a predefined number of improper signals, the bus protection elements can selectively connect and disconnect respective network devices (18) to and from the network.

대표청구항 ▼

What is claimed is: 1. A system for maintaining proper termination and error-free communication in a network bus including a power bus comprising: at least one network device electrically connected to and adapted to communicate via said network bus, wherein said at least one network device is confi

What is claimed is: 1. A system for maintaining proper termination and error-free communication in a network bus including a power bus comprising: at least one network device electrically connected to and adapted to communicate via said network bus, wherein said at least one network device is configured to transmit signals to said network bus, and configured to receive signals from said network bus; and a network controller electrically connected to said network bus, wherein said network controller is adapted to direct communications with said at least one network device via said network bus, and wherein said network controller is adapted to provide power signals to said at least one network device via the power bus of the network bus; and at least one bus protection element disposed between said at least one network device and the network bus, wherein each bus protection element comprises: at least one isolation switch disposed between a respective network device and the bus, wherein said at least one isolation switch is configured to controllably halt the transmission of signals from the respective network device onto the bus; and a logic element electrically connected to said at least one isolation switch and the respective network device and configured to monitor signals on the network bus to thereby identify improper signals on the network bus, including being configured to receive signals transmitted from the respective network device to said network bus and determine when any of the respective signals are improper signals, and wherein said logic element is configured to controllably operate said at least one isolation switch to selectively connect and disconnect the respective network device to and from the network bus based upon said logic element identifying a predefined number of improper signal. 2. A system according to claim 1, wherein said at least one bus protection element is configured to monitor the signals transmitted by said at least one network device and the signals received by said at least one network device, wherein said at least one bus protection element is configured to identify improper signals transmitted by said at least one network device and controllably halt the transmission of signals from respective network devices onto the network bus if a predefined number of improper signals are identified. 3. A system according to claim 2, wherein each network device includes a communications interface comprising: a transmitter configured to transmit signals from the network device to the network bus; and a receiver configured to receive signals on behalf of the network device from the network bus, wherein said at least one bus protection element is configured to monitor the signals transmitted by the transmitter and the signals received by the receiver. 4. A system according to claim 3 further comprising: at least one diagnostic switch electrically connected to and disposed between the at least one transmitter and said at least one network device, wherein said at least one diagnostic switch is electrically connected to said at least one bus protection element, and wherein said at least one diagnostic switch is configured to controllably halt the transmission of signals from a respective network device to the respective transmitter, wherein each bus protection element is configured to controllably operate a respective diagnostic switch if a predefined number of improper transmitted signals are identified, the transmitter and receiver associated with a respective network device are electrically connected such that after the bus protection element controllably operates the respective diagnostic switch to halt the transmission of signals from the respective network device the bus protection element is configured to transmit diagnostic signals and receive corresponding return signals, and wherein the bus protection element is configured to compare the diagnostic signals and the return signals such that when the diagnostic signals and the return signals are substantially identical the bus protection element is configured to controllably operate the respective at least one isolation switch and the respective diagnostic switch to permit the transmission of signals from the respective network device. 5. A method for maintaining proper termination and error-free communication conducted via a network bus that is electrically connected to at least one network device, wherein the network bus includes a power bus, said method comprising: providing at least one bus protection element disposed between the at least one network device and the network bus, each of the at least one bus protection element including at least one isolation switch configured to controllably halt the transmission of signals from a respective network device onto the bus; monitoring signals on the network bus, including receiving signals transmitted from the at least one network device to the network bus and determining when any of the respective signals are improper signals; identifying a predefined number of improper signals from the received signals; and controllably operating the at least one isolation switch to switchably disconnect at least one network device after identifying a predefined number of improper signals transmitted from the respective at least one network device. 6. A method according to claim 5, wherein monitoring comprises monitoring signals transmitted by the at least one network device to the network bus and the signals received by the at least one network device from the network bus, wherein identifying comprises identifying a predefined number of improper signals from the signals transmitted by the at least one network device to the network bus, and wherein switchably disconnecting comprises halting the transmission of signals from the at least one network device after identifying the predefined number of improper signals. 7. A method according to claim 6, wherein each network device includes a transmitter for transmitting signals from the network device to the network bus, and a receiver for receiving signals on behalf of the network device from the network bus, wherein each respective transmitter and receiver are electrically connected, said method further comprising: transmitting diagnostic signals through the respective transmitter and thereafter receiving corresponding return signals from the respective receiver after halting the transmission of signals from the respective network device; comparing the diagnostic signals and the return signals; and permitting the transmission of signals from the respective network device to the network bus, wherein said permitting the transmission of signals comprises permitting the transmission of signals when the diagnostic signals and the return signals are substantially identical. 8. An apparatus for operation with a network device electrically connected to and adapted to communicate via a bus, wherein the network device includes a communications interface having a transmitter configured to transmit signals from the network device to the bus, and a receiver configured to receive signals on behalf of the network device from the bus, said apparatus comprising: at least one isolation switch disposed between the communications interface and the bus, wherein said at least one isolation switch is configured to controllably halt the transmission of signals from the network device onto the bus; and a logic element electrically connected to said at least one isolation switch and the communications interface and configured to monitor the signals transmitted by the transmitter and the signals received by the receiver, wherein said logic element being configured to monitor the signals includes being configured to receive the signals transmitted by the transmitter and determine when any of the respective signals are improper signals to thereby identify improper signals transmitted by the transmitter, and wherein said logic element is configured to controllably operate said at least one isolation switch thereby halting the transmission of signals from the network device if a predefined number of improper transmitted signals are identified. 9. An apparatus according to claim 8, wherein the predefined number of improper signals is dependant upon a predetermined number of signals transmitted by the transmitter, and wherein said logic element is configured to identify the predetermined number of signals transmitted by the transmitter and controllably operate said at least one isolation switch thereby halting the transmission of signals from the network device if a predefined number of improper transmitted signals are identified. 10. An apparatus according to claim 8 further comprising: two diagnostic switches, wherein one diagnostic switch is disposed between the transmitter and the network device and the other diagnostic switch is disposed between the receiver and the network device, and wherein said diagnostic switches are configured to controllably halt the transmission of signals from the network device to the transmitter and the reception of signals by the network device from the receiver, wherein said logic element is configured to controllably operate said diagnostic switches if a predefined number of improper transmitted signals are identified, wherein the transmitter and receiver are electrically connected such that after said logic element controllably operates said diagnostic switches to halt the transmission of signals from the network device and the reception of signals by the network device said logic element is configured to transmit diagnostic signals through the transmitter and receive corresponding return signals from the receiver, and wherein said logic element is configured to compare the diagnostic signals and the return signals such that when the diagnostic signals and the return signals are substantially identical said logic element is configured to controllably operate said at least one isolation switch and said diagnostic switch to permit the transmission of signals from the network device to the bus via the transmitter. 11. An apparatus according to claim 8, wherein said at least one isolation switch operates in at least one of an on mode wherein said at least one isolation switch permits the network device to transmit signals to the bus, or an off mode wherein said at least one isolation switch prevents the network device from transmitting signals to the bus, and wherein said logic element is configured to controllably operate the mode of said at least one isolation switch. 12. An apparatus according to claim 11, wherein said logic element is configured to operate said at least one isolation switch in the on mode before identifying the predefined number of improper signals, and wherein said logic element is configured to place said at least one switch in the off mode after identifying the predefined number of improper signals. 13. An apparatus according to claim 12 further comprising: a diagnostic switch disposed between the transmitter and the network device, wherein said diagnostic switch operates in at least one of an on mode wherein said diagnostic switch permits the network device to transmit signals to the transmitter, or an off mode wherein said at least one isolation switch prevents the network device from transmitting signals to the transmitter, wherein said logic element is configured to controllably operate said diagnostic switch in the on mode before identifying the predefined number of improper signals, wherein said logic element is configured to place said diagnostic switch in the off mode after identifying the predefined number of improper transmitted signals, wherein the transmitter and receiver are electrically connected such that after said logic element controllably places said diagnostic switch in the off mode said logic element is configured to transmit diagnostic signals through the transmitter and receive corresponding return signals from the receiver, and wherein said logic element is configured to compare the diagnostic signals and the return signals such that when the diagnostic signals and the return signals are substantially identical said logic element is configured to place said at least one isolation switch and said diagnostic switch in the on mode.