# US 7,609,713 B2 · Associating a signal measurement with a communication device on a network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,713 B2 - Document ID: US7609713B2 - Status: Granted - Kind: B2 - Application number: 11/238,670 - Filed: 2005-09-29 - Published: 2007-03-29 - Granted: 2009-10-27 - Earliest claimed: 2005-09-29 - Assignees: Fisher-Rosemount Systems, Inc. - Inventors: Anthony D. Ferguson; Brian A. Franchuk - Web page: https://patentgrep.com/patent/US7609713B2 ## CPC - H04L 43/0864: Round trip delays - H04L 12/417: with deterministic access, e.g. token passing - H04L 43/16: Threshold monitoring - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A signal measured on a network is associated with one of a plurality of communication devices connected to the network. The designation address of an active communication device that is scheduled to communicate next is determined. The next received signal on the network is associated with the designation address of the active communication device if the signal is received within a maximum response time. ## Claims ### Claim 1 A method for associating a signal measured on a network with one of a plurality of communication devices connected to the network, the method comprising: monitoring scheduled network communications; determining a designation address of an active communication device that is scheduled to communicate next on the network; measuring an amplitude of a next received signal on the network; associating the next received signal on the network with the designation address of the active communication device if the next received signal is received within a maximum response time; and producing an output indicating an error associated with the designation address if the measured amplitude of the next received signal is outside a normal network amplitude range. ### Claim 2 (depends on 1) The method of claim 1, wherein the active communication device receives a communication token message when it is scheduled to communicate next on the network. ### Claim 3 (depends on 2) The method of claim 2, wherein the designation address is derived from the communication token message. ### Claim 4 (depends on 1) The method of claim 1, wherein the maximum response time is derived from network settings. ### Claim 5 (depends on 4) The method of claim 4, wherein the network settings are derived from information contained in a device probe message on the network. ### Claim 6 A method for identifying a defective device on a network, the method comprising: determining a designation address of an active communication device that is scheduled to communicate next on the network by monitoring network communication; measuring an amplitude of a next received signal on the network; associating the next received signal with the designation address of the active communication device if the next received signal is received within a maximum response time; and producing an output indicating that the active communication device is defective when the measured amplitude is outside a normal network amplitude range. ### Claim 7 (depends on 6) The method of claim 6, wherein the active communication device receives a communication token message when it is scheduled to communicate next on the network. ### Claim 8 (depends on 7) The method of claim 7, wherein the designation address is derived from the communication token message. ### Claim 9 (depends on 6) The method of claim 6, wherein the maximum response time is derived from network settings. ### Claim 10 (depends on 9) The method of claim 9, wherein the network settings are derived from information contained in a device probe message on the network. ### Claim 11 (depends on 6) The method of claim 6, wherein the output is produced when the measured amplitude exceeds the normal network amplitude range. ### Claim 12 (depends on 6) The method of claim 6, wherein the output is produced when the measured amplitude is less than the normal network amplitude range. ### Claim 13 A method for tracking devices that are active on a communication network, the method comprising: monitoring scheduled network communication: determining a designation address of an active communication device that is scheduled to communicate next on the network; associating a next received communication with the designation address of the active communication device if the next received communication is received within a maximum response time; storing the designation address of the active communication device in a list containing the designation addresses of all devices that are active on the network; measuring the amplitude of the next received communication; and producing an output associated with the designation address if the amplitude is outside a normal range. ### Claim 14 (depends on 13) The method of claim 13, wherein the active communication device receives a communication token message when it is scheduled to communicate next on the network. ### Claim 15 (depends on 14) The method of claim 14, wherein the designation address is derived from the communication token message. ### Claim 16 (depends on 13) The method of claim 13, wherein the maximum response time is derived from network settings. ### Claim 17 (depends on 16) The method of claim 16, wherein the network settings are derived from information contained in a device probe message on the network. ### Claim 18 (depends on 13) The method of claim 13, wherein the designation address of the active communication device is removed from the list if the next received signal is not received within the maximum response time. ### Claim 19 A diagnostic tool for connecting to a communication medium, the diagnostic tool comprising: a medium attachment unit (MAU) connected to the communication medium which is operable to receive signals from the communication medium via the conductive elements; a communication controller connected to the MAU which is operable to determine a designation address of an active communication device that is scheduled to communicate next on the network by monitoring network communication; and a processor connected to the communication controller which is operable to associate a next received signal on the network with the designation address of the active communication device if the next received signal is received within a maximum response time and produce an output when a measured amplitude of the next received signal is outside a normal amplitude range. ### Claim 20 (depends on 19) The diagnostic tool of claim 19, wherein the address is derived from a communication token message.