Switchable bus termination and address selector
First Claim
1. In a communication network having a plurality of devices for communication therebetween over at least one transmission path coupling the devices together, at least one said device being addressable and responsive to a selected address for communication, a switchable termination module associated with said at least one addressable device, the module comprising:
- a port for connection to the at least one transmission path;
a controllable terminator for the at least one transmission path connected to the port; and
a switch having a first set of switch conditions for enabling the terminator to terminate the transmission path and for simultaneously selecting one of a plurality of addresses to which the at least one device responds, and a second set of switch conditions for disabling the terminations of the terminator and for simultaneously selecting any one of a plurality of addresses for the at least one device.
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Accused Products
Abstract
A switchable termination module for use with addressable devices on a communication bus has a terminator for each signal transmission path, a signal source, for example a switch for signalling whether termination is desired and a terminator control circuit for engaging and disengaging the terminators in response to the signal from the signal source. The control circuit has a transistor between the source of potential and the terminators to couple the terminators to the transmission paths when termination is desired. The switch which signals whether termination is desired may also be used to select the address for the device.
88 Citations
16 Claims
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1. In a communication network having a plurality of devices for communication therebetween over at least one transmission path coupling the devices together, at least one said device being addressable and responsive to a selected address for communication, a switchable termination module associated with said at least one addressable device, the module comprising:
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a port for connection to the at least one transmission path; a controllable terminator for the at least one transmission path connected to the port; and a switch having a first set of switch conditions for enabling the terminator to terminate the transmission path and for simultaneously selecting one of a plurality of addresses to which the at least one device responds, and a second set of switch conditions for disabling the terminations of the terminator and for simultaneously selecting any one of a plurality of addresses for the at least one device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a network of signal communication devices capable of signal communication with each other over signal transmission paths, where each path comprises a signal line side and a return path side for signals, where at least one of such communication devices comprises a controller responsive to an address and a terminating impedance selector, for recognition of a selected address received over at least one of the transmission paths for effecting such signal communication, the address and terminating impedance selector comprising:
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a plurality of terminating impedances, at least one of said terminating impedances corresponding to each such transmission path for terminating the corresponding transmission path substantially in its characteristic impedance; a switching circuit comprising a controllable switch having a first plurality of settings, each setting enabling the switching circuit to couple each said terminating impedance between the sides of the corresponding transmission path, and each said setting enabling such controller to select a different one of a plurality of addresses for recognition by the controller; and the controllable switch having a second different plurality of settings, each said second setting enabling said controller to select, without coupling of the terminating impedances between the transmission paths by the switching circuit, a different one of the same said plurality of addresses for recognition. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification