Identification of HVAC systems in a communication network

• US 5,818,347 A
• Filed: 12/26/1995
• Issued: 10/06/1998
• Est. Priority Date: 12/26/1995
• Status: Expired due to Term

• Current Assignee: Carrier Corporation (Carrier Global Corporation)
• Original Assignee: Carrier Corporation (Carrier Global Corporation)
• Inventors: Phillips, Thomas R., Dolan, Robert P., Hill, Mark A., DeWolf, Thomas L.
• Primary Examiner(s): Horabik, Michael
• Assistant Examiner(s): Asongwed, Anthony A.
• Application Number:
  US08/578,348
• Time in Patent Office: 1,015 Days
• Field of Search: 340/825.52, 340/825.21, 340/825.07, 395/200.1, 395/200.11, 395/200.16, 395/829, 364/164, 236/2, 236/37, 236/91, 165/201, 165/287
• US Class Current: 340/9.16
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/62 characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
• CPC Class Codes: F24F 11/63 Electronic processing
• CPC Class Codes: G05B 19/042 using digital processors G05B19/05 takes precedence
• CPC Class Codes: G05B 2219/21047 Select module if address of module equals required address, compare addresses
• CPC Class Codes: G05B 2219/2638 Airconditioning
• CPC Class Codes: H04L 12/2803 Home automation networks
• CPC Class Codes: H04L 12/282 based on user interaction within the home receiver circuitry for displaying additional information being controlled by a remote control apparatus H04N21/42204
• CPC Class Codes: H04L 2012/2841 Wireless
• CPC Class Codes: H04L 2012/285 Generic home appliances, e.g. refrigerators
• CPC Class Codes: H04L 61/5038 for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]
• CPC Class Codes: H04L 61/5046 Resolving address allocation conflicts; Testing of addresses testing when self-assigning an address H04L61/5092

Abstract

An HVAC system is assigned a network identification for subsequent use within a communication network upon receipt of a formatted signal containing the network identification. The HVAC system stores the network identification in nonvolatile memory. The HVAC system also preferably stores a verification image of the communicated network identification so that any reading back of the network identification can be validated through comparison with the stored verification image.

Claims

1. A process for assigning values of identifications to networked HVAC systems within a communication network wherein the HVAC systems within the network can be identified and communicated with by other devices within the network using assigned values of network identifications to the HVAC systems, said process comprising the steps of:

transmitting a signal containing the value of a network identification to be assigned to a particular HVAC system in a predetermined signal format;

receiving the signal containing the value of the network identification at a receiver within the particular HVAC system that is to be assigned the network identification;

forwarding the value of the network identification to a programmed processor associated with the receiver within the particular HVAC system that is to be assigned the network identification; and

assigning the value of the network identification to the HVAC system by storing the value of the network identification in a non-volatile memory associated with the programmed processor so that the value stored in the memory can thereafter be used by the programmed processor to identify the particular HVAC system within the network.

2. The process of claim 1 further comprising the step of:

reading the value of the network identification stored in the nonvolatile memory following an outage of electrical power to the HVAC system;

setting a network identifier variable equal to the value of the network identification read from the nonvolatile memory so that the value of the network identifier variable can thereafter be used by the processor in identifying the particular HVAC system within the network.

3. The process of claim 1 further comprising the steps of:

transforming the value of the communicated network identification to a verification image in accordance with a particular mathematical transformation; and

storing the verification image in the nonvolatile memory in association with the stored value of the network identification.

4. The process of claim 3 further comprising the steps of:

reading both the value of the network identification stored in the nonvolatile memory and the value of the verification image associated therewith;

comparing the read values of the network identification and the associated verification image to determine whether the value of the verification image has a predetermined mathematical relationship with respect to the value of the network identification that is dictated by said step of transforming the value of the network identification to the verification image; and

setting a network identifier variable equal to the value of the network identification read from the nonvolatile memory when the read values of the network identification and associated verification image have the mathematical relationship dictated by said step of transforming the value of the network identification whereby the value of the network identifier variable can be used by the processor in identifying the particular HVAC system.

5. The process of claim 1 wherein said step of transmitting a signal containing the value of a network identification in a predetermined signal format comprises the step of:

transmitting a header code for the network identification followed by the value of the network identification.

6. The process of claim 5 wherein said step of receiving the signal containing the network identification comprises the steps of:

temporarily storing the header code in association with value of the network identification.

7. The process of claim 6 wherein said step of storing the value of the network identification comprises the step of:

reading the temporarily stored header code for the network identification;

associating the temporarily stored header code with a network identifier variable;

setting the network identifier variable equal to the value of the network identification associated with the header code; and

storing the value of the network identifier variable equal to in the memory associated with the programmed processor.

8. The process of claim 7 wherein said step of associating the temporarily stored header code with the network identifier variable comprises the step of:

looking up the header code in a table containing various header codes of possible control values of parameters that can be received by the processor, each header code being associated with a particular variable used in a program executable by the processor.

9. The process of claim 1 wherein said step of storing the value of the network identification in a non-volatile memory includes the step of:

writing the value of the network identification to at least one addressable location in the non-volatile memory that has been set aside for storing a value of the network identification.

10. The process of claim 9 further comprising the steps of:

transforming the value of the network identification verification image in accordance with a particular mathematical transformation; and

storing the value of the verification image in a portion of each addressable location set aside for receiving value of the network identification.

11. The process of claim 10 further comprising the step of:

reading the stored value of the network identification from each addressable location set aside to receive value of the network identification;

reading the stored verification image of the stored value of the network identification from each such addressable location;

comparing the read verification image of the stored value of the network identification with the read value of the network identification from each addressable location set aside to receive the network identification to determine whether the verification image reflects the mathematical relationship dictated by said step of transforming the value of the network identification to verification image; and

rewriting the value of the network identification and the verification image to any addressable memory location when the read verification image does not have the predetermined mathematical relationship with respect to the read value of the network identification variable for that addressable memory location.

12. The process of claim 10 further comprising the step of:

reading both the value of the network identification and the value of the verification image from at least one addressable memory location in the nonvolatile memory set aside for storing a value of the network identification following an outage of electrical power to the HVAC system;

comparing the values of the network identification and verification image read from the at least one addressable location to determine whether the value of the verification image has a predetermined mathematical relationship with respect to the value of the network identification dictated by said step of transforming the value of the network identification to the verification image; and

setting a network identifier variable equal to the value of the network identification read from the at least one addressable location when the read values of the network identification and verification image have the predetermined mathematical relationship dictated by said step of transforming the value of the network identification to the verification image whereby the value of the network identifier variable can be used by the processor in identifying the particular HVAC system within the network.

15. The process of claim 1 wherein the network identification is the network address of the HVAC system used by other network devices to address the particular HVAC system.

16. The process of claim 15 wherein said step of transmitting a signal containing the value of the network identification comprises the step of:

transmitting a signal containing the value of the network identification from a device that is not itself part of the communication network of devices which address the HVAC system when communication is to occur with the HVAC system over the network.

17. The process of claim 1 wherein the communication network comprises a communication bus utilized to transmit communications to devices connected thereto including the HVAC systems and wherein said step of transmitting a signal containing the value of the network identification comprises the step of:

transmitting the value of the network identification from a device that is not connected to the communication bus utilized to transmit communications to devices connected thereto.

13. The process of clam 12 further comprising the step of:

reading both the value of the network identification and the value of the verification image from the at least one further addressable location in the nonvolatile memory set aside for storing a value of the network identification following an outage of electrical power to the HVAC system when the read values of the network identification and the verification image from the previously read memory location do not have the predetermined mathematical relationship dictated by said step of transforming the value of the network identification to the verification image;

comparing the values of the network identification and verification image read from the at least one further addressable location to determine whether the value of the verification image has the predetermined mathematical relationship with respect to the value of the network identification dictated by said step of transforming the value of the network identification to the verification image; and

setting a network identifier variable equal to the value of the network identification read from the at least one further addressable location when the read values of the network identification and verification image have the predetermined mathematical relationship dictated by said step of transforming the value of the network identification to the verification image whereby the value of the network identifier variable can be used by the processor in identifying the particular HVAC system within the network.

14. The process of claim 13 further comprising:

setting the network identifier variable equal to a default value when the read values from all addressable locations in the nonvolatile memory set aside for storing a value of the network identification fail to demonstrate the predetermined relationship dictated by said step of transforming the value of the network identification to the verification image whereby the value of the network identifier variable is be used by the processor in identifying the particular HVAC system within the network.

18. A communications network comprising a plurality of HVAC devices connected to a communications bus wherein at least some of the HVAC devices receive communications over the communications bus from other devices connected to the communications bus wherein at least one of the HVAC devices receiving the communications comprises:

a receiver for receiving a communicated network identification of the HVAC device;

a processor for processing the network identification of the HVAC device; and

a nonvolatile memory associated with the processor for storing the processed network identification of the HVAC device so that the processed network identification of the HVAC device can be thereafter used by devices connected to the communications bus to address the HVAC device when communication is to occur with the HVAC device over the communication bus.

19. The communications network of claim 18 furthermore comprising:

a device not connected to the communications bus for communicating the network identification of the HVAC device to said receiver for receiving the communicated network identification of the HVAC device.