Apparatus and method for data communication between heavy duty vehicle and remote data communication terminal

[0002] This application is a continuation of Ser. No. 08/907,861 filed on Aug. 8, 1997, now U.S. Pat. No. 6,064,249, which is a continuation-in-part of U.S. Ser. No. 08/594,255 filed on Jan. 30, 1996, which a continuation-in-part of U.S. Ser. No. 08/554,907, filed Nov. 9, 1995, which has been abandoned.

[0003] The present invention relates to the field of heavy duty vehicle data communications and, more particularly, to data communications from a heavy duty vehicle, such as a tractor or a trailer of a truck, to a remote location.

[0004] Over the years, the heavy duty vehicle industry has used tractor and trailer combinations to transport cargo over the roadways to various desired destinations. The tractors and trailer are conventionally mechanically coupled together so that the tractor efficiently and effectively pulls the trailer. Often, one or more additional trailer are also mechanically coupled to another trailer so that only one tractor pulls a plurality of trailers.

[0005] Various links between the tractor and the trailer provide vehicle subsystems, e.g., hydraulic, pneumatic, or electrical, with power and/or control signals to operate effectively. These subsystem have associated electrical conductors, pneumatic lines, or hydraulic lines extending between the tractor and trailer(s) so that these subsystems can effectively operate.

[0006] Data communications between a tractor and trailer for these subsystems also has been developed. An example of this data communications can be seen in U.S. Pat. No. 5,488,352 by Jasper titled “Communications And Control System For Tractor/Trailer And Associated Method” which is assigned to the common assignee of the present application. As described in this patent, the use of the Society of Automotive Engineering (“SAE”) standard J1708 titled “Serial Data Communications Between Microcomputer Systems In Heavy Duty Vehicle .Applications” and SAE standard J1939 are also known for data communications in the heavy duty vehicle environment.

[0007] Only recently, however, has the heavy duty vehicle industries begun to use sophisticated electrical electronic subsystems in and associated with these vehicles to perform varied task that usually involve data manipulation and transmission. Previously, computers, controllers, and computer-type electrical systems were simply not found in these vehicles, such as the tractor and trailer combinations or recreational vehicles, in a significant manner. Much of this previous slow or lack of development and advances could be attributed, for example, to the lack of governmental or other authoritative initiatives which would have otherwise required systems to be installed on these heavy duty vehicles to include sophisticated electronics and data communications.

[0008] Although only recently have advances been made with data communications in the heavy duty vehicle industries, many of the advances require extensive retrofitting or extensive additions to the heavy duty vehicle. Accordingly, many vehicle owners have been hesitant to adopt and purchase sophisticated electronics and data communications because of the expense and uncertainty with the advances in the technology. Yet, having the capability to monitor and communicate with the various electronic subsystems of a heavy duty vehicle such as a tractor-trailer truck or recreational vehicle can be beneficial to the driver, the owner, governmental officials or agencies, and others having an interest in the heavy duty vehicle industries.

[0009] With the foregoing in mind, the present invention advantageously provides an apparatus and methods of data communication between a heavy duty vehicle and a remote data communication terminal so that various operating characteristics of the vehicle can be monitor or observed. The present invention also advantageously provides an apparatus and methods of data communication for discretely and compactly communicating data between a heavy duty vehicle and a remote data communication terminal. The present invention additionally provides an apparatus and method of data communication which is readily adapted to existing heavy duty vehicle data communication technology and does not require either extensive retrofitting or extensive and expensive additions to existing heavy duty vehicle data communication technology. The present invention further advantageously provides an apparatus and methods of data communication so that when the apparatus is mounted to a heavy duty vehicle a third party would not readily recognize that the heavy duty vehicle is equipped for data communications from the vehicle to a remote data communications terminal.

[0010] More particularly, a combination of a heavy duty vehicle and a data communication apparatus are provided according to the present invention. The heavy duty vehicle is preferably a tractor and a trailer connected to the tractor. The tractor preferably includes a cab. The data communications apparatus is preferably connected to the tractor and the trailer for communicating data to and from the tractor and the trailer to a remote data terminal. The data communications apparatus preferably includes a plurality of electrical conductors associated with and extending between the tractor and the trailer. A connector is connected in series with the plurality of electrical conductors and positioned in the cab of the tractor. The apparatus also includes vehicle data communications protocol converting means connected to the plurality of electrical conductors for converting a first data communications protocol used to communicate data along the plurality of electrical conductors to a second data communications protocol. For example, the second data communications protocol is preferably one of either an infrared data communications protocol or a radio frequency (“RF”) data communications protocol. A first transceiver is associated with the connector and is connected to the vehicle data communications protocol converting means for transmitting and receiving the second data communications protocol. A remote data communication terminal which preferably includes a second transceiver for transmitting the second data communications protocol to the first transceiver and receiving the data communications protocol from the first transceiver.

[0011] Also, according to another aspect of the present invention, the data communication apparatus preferably includes a plurality of electrical conductors associated with a heavy duty vehicle. Vehicle data communications protocol converting means is preferably connected to the plurality of electrical conductors for converting a first data communications protocol associated with data communications along the plurality of electrical conductors to a second data communications protocol. The apparatus also preferably includes a transceiver connected to the vehicle data communications protocol converter for transmitting the data communications protocol from the heavy duty vehicle and receiving the data communications protocol from a remote data communications terminal.

[0012] According to yet another aspect of the present invention, an apparatus for data communications associated with a heavy duty vehicle preferably includes a transceiver housing adapted to be detachably connected to a connector mounted to a heavy duty vehicle. The connector is connected to a plurality of electrical conductors associated with the heavy duty vehicle. Vehicle data communications protocol converting means is preferably positioned in the transceiver housing for converting a first data communications protocol associated with data communications along the plurality of electrical conductors to a second data communications protocol. The apparatus also has a transceiver positioned within the transceiver housing and connected to the vehicle data communications protocol converting means for transmitting the second data communications protocol from the heavy duty vehicle and receiving the data communications protocol from a remote data communications terminal.

[0013] Still another aspect of the present invention, an apparatus for data communications associated with a heavy duty vehicle preferably includes a transceiver housing mounted to a heavy duty vehicle. The transceiver housing is preferably a vehicle light housing such as a side light marker housing. Vehicle data communications protocol converting means is preferably positioned in the transceiver housing for converting a first data communications protocol associated with data communications along the plurality of electrical conductors to a second data communications protocol. A transceiver is preferably positioned within the transceiver housing and is connected to the vehicle data communications protocol converting means for transmitting the second data communications protocol from the heavy duty vehicle and receiving the data communications protocol from a remote data communications terminal.

[0014] A method of data communications associated with a heavy duty vehicle is also provided according to the present invention. The method preferably includes providing a plurality of electrical conductors associated with a heavy duty vehicle and converting a first data communications protocol associated with data communications along the plurality of conductors to a second data communications protocol. The second data communications protocol is preferably one of either an infrared data communications protocol or a radio frequency (“RF”) data communications protocol. The method also includes transmitting the data communications protocol from the heavy duty vehicle to a remote data communications terminal.

[0015] Some of the objects and advantages of the present invention having been stated, others will become apparent as the description proceeds when taken in conjunction with the accompanying drawings in which:

[0016] FIG. 1 is a side elevational view of a heavy duty vehicle in an embodiment as a tractor/trailer truck in combination with an apparatus for data communications between the truck and a remote data communication terminal according to the present invention;

[0017] FIG. 2 is a perspective view of an apparatus for data communications between a heavy duty vehicle and a remote data communications terminal having a transceiver positioned in a cab of a tractor of a tractor/trailer truck according to a first embodiment of the present invention;

[0018] FIG. 3 is a perspective view of an apparatus for data communications between a heavy duty vehicle and a remote data communications terminal having a transceiver positioned in a cab of a tractor of a tractor/trailer truck and a remote data communications terminal positioned in the hands of a driver according to a first embodiment of the present invention;

[0019] FIG. 4 is an exploded perspective view of a connector, a transceiver housing, and a transceiver of an apparatus for data communications between a heavy duty vehicle and a remote data communications terminal according to a first embodiment of the present invention;

[0020] FIG. 5 is a schematic block diagram of an apparatus for data communications between a heavy duty vehicle and a remote data communications terminal according to the present invention;

[0021] FIG. 6 is a fragmentary side elevational view of an apparatus for data communications between a heavy duty vehicle and a remote data communications terminal according to a second embodiment of the present invention;

[0022] FIG. 7 is an enlarged perspective view of a vehicle light housing in the form of a vehicle side light marker housing having portions thereof broken away for clarity and having a transceiver positioned therein of an apparatus for data communications between a heavy duty vehicle and a remote data communications terminal according to a second embodiment of the present invention;

[0023] FIG. 8 is an enlarged perspective view of a connector, a transceiver housing, and a transceiver positioned in the transceiver housing of an apparatus for data communications between a heavy duty vehicle and a remote data communications terminal according to a third embodiment of the present invention;

[0024] FIG. 9 is a sectional view of a transceiver housing of an apparatus for data communications between a heavy duty vehicle and a remote data communications terminal taken along line 9—9 of FIG. 8 according to a third embodiment of the present invention;

[0025] FIG. 10 is a side elevational view of an apparatus for data communications between a heavy duty vehicle and a remote data communications terminal according to a third embodiment of the present invention; and

[0026] FIG. 11 is schematic block diagram of an apparatus for data communications between a heavy duty vehicle and a remote data communications terminal according to the present invention.

[0027] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the illustrated embodiments set forth herein. Rather, these illustrated embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout, and prime and double prime notation are used to indicate similar elements in alternative embodiments.

[0028] FIGS. 1-3 illustrate an apparatus 30 for data communications associated with a heavy duty vehicle 20, namely a tractor/trailer combination or tractor/trailer truck, according to a first embodiment of the present invention. As understood by those skilled in the art, the tractor/trailer combination preferably includes a tractor 21 connected to a trailer 25 for pulling the trailer 25. The tractor 21 and trailer 25 include respective frames and coupling means for coupling the trailer 25 to the tractor 21. In addition, the tractor 21 includes an engine, such as a diesel engine or other motor, for moving the tractor 21 to thereby pull the trailer 25. It will also be understood by those skilled in the art that other types of heavy duty vehicles, such as a recreational vehicle, agricultural tractors or other heavy duty vehicles used in association with agricultural uses, can also be used according to the present invention.

[0029] The data communications apparatus 30 preferably includes at least one electronic subsystem 40 associated with the heavy duty vehicle 20. The at least one electronic subsystem 40, for example, can include an anti-locking brake system (“ABS”) 41 connected to the heavy duty vehicle 20. The tractor/trailer combination, however, preferably includes a plurality of electronic subsystems associated with tractor 21 and/or trailer 25. The electronic subsystems 40 preferably produce data or includes some type of signal generating means, e.g., preferably provided by a signal generator 42. Some examples of these electronic subsystems 40 and features which may be controlled and/or monitored by the apparatus of the present invention are illustrated for a tractor/trailer combination in Table I and for an agricultural tractor in Table II below:

[0030] The data communications apparatus 30 also preferably includes a plurality of electrical conductors 38, e.g., preferably provided by twisted pair wiring as understood by those skilled in the art, which are preferably connected to the plurality of electronic subsystems 40 and associated with the heavy duty vehicle 20. The plurality of electrical conductors 38 preferably provide one or more data communications channels or paths for data communications with the electronic subsystems 40, as well as a controller 45 as described further below herein.

[0031] As perhaps best illustrated in FIGS. 5 and 11, the data communications apparatus 30 preferably also has vehicle data communications protocol converting means 33, 33′, e.g., preferably provided by a vehicle data communications protocol converter as illustrated by first and second data communications protocol converters 37, 39, 37′, 39′ and a first signal booster 36, 36′, connected to the plurality of electrical conductors 38, 38′ for converting a first data communications protocol associated with data communications along the plurality of electrical conductors 38, 38′ to a second data communications protocol. As understood by those skilled in the art, the first data communications protocol is preferably according to SAE J1708, but also could be according to SAE J1939 or RS-485. In other words, the first data communications protocol is preferably an existing data communications protocol conventionally associated with the tractor/trailer combination or the heavy duty vehicle 20. The first data communications protocol converter 37 is preferably an RS-485 transceiver, as understood by those skilled in the art, which transmits and receives data communications according to the J1708 protocol to the plurality of conductors 38 and transmits and receives data communications according to the RS-485 protocol to the second data communications protocol converter 39 and vice-versa.

[0032] Additionally, the vehicle data communications protocol converting means 33 can convert the first data communications protocol, e.g., SAE J1708, into a third data communications protocol, e.g., RS-485, and then convert the third data communications protocol, e.g., RS-485, into yet the second data communications protocol, e.g., IrDa or other infrared or RF data communications protocol, which is used to transmit data through-the-air to a remote data communications terminal 60, 60′ (see FIGS. 5 and 11). The second data communications protocol converter 39 preferably is a combination of a microprocessor or other microcontroller connected to the RS-485 transceiver which transmits and receives logic level signals and an infrared IrDA compliant integrated circuit, such as provided by Hewlett Packard or Rohm as understood by those skilled in the art, connected to the microprocessor which transmits and receives the logic level signals.

[0033] When transmitting from the vehicle 20, the IrDA compliant integrated circuit receives logic levels from the microcontroller and converts the logic levels to IrDA data communications protocol based upon timed infrared pulse signals of a predetermined position, pulse widths, and/or duration depending on the desired baud or bit rate of data communications. The IrDA integrated circuit also receives an infrared data communications protocol and transmits logic levels when receiving data communications from a remote data communications terminal 60. The IrDA integrated circuit can include a built-in infrared transceiver 35, e.g., an infrared light emitting diode and an infrared photodetector or photodiode. At least the infrared light emitter or light emitting diode, however, is preferably not built into the IrDA integrated circuit because the vehicle data communications protocol converting means 33 also preferably includes the first signal booster 36.

[0034] The second data communications protocol is preferably one of either an infrared data communications protocol or an RF data communications protocol. In other words, the second data communications protocol is preferably a through-the-air type of data communications protocol which does not require equipment to be coupled to the heavy duty vehicle 20 when obtaining data therefrom or monitoring vehicle operational conditions. If the data communications is according to an RF data communications protocol as illustrated in FIG. 11, then the second data communication protocol converter 39′ preferably includes an RF data communications integrated circuit or analog circuit as understood by those skilled in the art which receives and transmits logic levels to a microprocessor or microcontroller and transmits and receives RF data communications according to predetermined RF data communications protocol, e.g., a simple modulation scheme or a more complex protocol such as CEBus as understood by those skilled in the art.

[0035] Additionally, particularly on the transmit portion of the vehicle data communications converting means 33, the converting means 33 also preferably includes a signal booster 36, e.g., preferably provided by amplification circuitry and/or power boosting circuitry, which advantageously boosts the transmit signal to thereby increase the successful transmit range of the associated transmit portion of the transceiver 35.

[0036] An infrared data communications protocol, such as IrDA as understood by those skilled in the art, can be particularly advantageous in association with heavy duty vehicles for numerous reasons. For example, dirt, dust, grime, corrosive atmospheres, vibration, rough handling, or other obstacles can often be readily overcome with appropriate design of the driving and receiving electronics. Also, infrared data communications is immune from electro-magnetic interference (“EMI”) which, as understood by those skilled in the art, can impact other types of data communications media. Further, infrared data communications would not interfere with other type of through-the-air data communications channels such as RF data communications.

[0037] As illustrated in FIGS. 1-2 and 4, a connector 50 is preferably connected to the plurality of electrical conductors 38. The connector 50 can also be connected to one or more of the electronic subsystems 40, e.g., an ABS system, preferably through the electrical conductors 38. For example, the connector 50 can be a six-pin Deutch connector or other well known connector associated with trucks or other heavy duty vehicles (see FIG. 4). The connector 50, in a first embodiment, also can be advantageously positioned in the cab 23 of the tractor 21 of the truck (see FIGS. 2-3). This location, for example, is a secure position for a transceiver 35, as described further below herein, because the cab 23 can be locked and a security alarm system or other security system can be associated with the cab 23. Additionally, the cab 23 provides a convenient position for the driver, government officials, or others involved in the related industry to provide access to operational conditions of the vehicle 20. This further takes advantage of existing positions of vehicle connectors to tap into or access the plurality of electrical conductors 38 which provide data or information to the cab of the tractor without requiring extensive rewiring, retrofitting, or adding expensive equipment to the vehicle 20.

[0038] As perhaps best illustrated in FIGS. 8-10, in a second embodiment of the connector 50′, for example, the connector 50′ can be positioned more closely in association with one of the electronic subsystems 40 such as the ABS system of the trailer 25 of the truck. The second embodiment also illustrates a connector 50′ known to those in the heavy duty vehicle art, and namely the trucking industry. This connector 50′, however, is advantageously modified by adding a transceiver housing 34 and a transceiver 35 as described further below herein. In each of the first and second embodiments, the connector 50, 50′ preferably includes a plurality of pins 55 having a predetermined pin configuration. The connector 50, 50′ also preferably has one of either a generally cylindrical or a generally rectangular shape.

[0039] The connector 50, 50′ also preferably has first and second mating connector portions 51, 52, 51′, 52′ which are joined together by a frictional fit so that the plurality of pins 55 are matingly received into a corresponding plurality of contact elements 56. As understood by those skilled in the art, the connector 50, 50′ can also have some type of connector aligning means associated therewith for readily aligning the first and second mating connector portions 51, 52, 51′, 52′.

[0040] A transceiver housing 34 is preferably detachably connected to the connector 50, 50′. The transceiver housing 34, 34′ also preferably includes a translucent cover member 31 for transmitting the second data communications protocol therethrough. In a first embodiment of the transceiver housing 34, the transceiver housing 34 can either include the second mating connector portion 52 being formed as a portion of or integrally as a single piece therewith, or the second mating connector portion 52 can define the transceiver housing 34. The transceiver housing 34 in this embodiment likewise preferably has one of either a cylindrical or a rectangular shape. The transceiver housing 34 preferably includes or has integrally formed as one piece therewith an optically translucent cover member 31 for transmitting and receiving infrared or RF data communications therethrough to the remote data communications terminal 60. Advantageously, because the transceiver housing 34 forms a portion of or readily attaches to a standard vehicle connector, e.g., the first mating connector portion 51, the data communications apparatus 30 is readily adapted to existing heavy duty vehicle data communication technology and does not require either extensive retrofitting or extensive and expensive additions to existing heavy duty vehicle data communication technology.

[0041] As perhaps best illustrated in FIGS. 6-7, in a second embodiment of the transceiver housing 34′, the transceiver housing 34′ can advantageously be a vehicle light housing mounted to the heavy duty vehicle 20 for housing a vehicle light. The vehicle light housing, for example, can advantageously be a side-marker light housing mounted to the trailer 25 of a truck so that a third party would not readily recognize that the truck is equipped with the data communications apparatus 30.

[0042] A transceiver 35 is preferably positioned within the transceiver housing 34, 34′ and connected to the vehicle data communications protocol converting means 33 for transmitting the second data communications protocol from the heavy duty vehicle 20 and receiving the data communications protocol from a remote data communications terminal 60. For infrared data communications, for example, the transceiver 35 (see also FIG. 4) preferably includes a plurality of infrared light emitter or light emitting diodes, a plurality of infrared photodiodes, and associated drive and amplification circuitry as understood by those skilled in the art.

[0043] As also understood by those skilled in the art, the transceiver 35 is preferably only a physical layer signal processing transceiver, e.g., infrared or radio frequency, and preferably includes a combination transmitter and receiver which collects data or information from the various subsystems and communicates the data to one or more remote data communications terminals 60. The transceiver 35 is preferably a first transceiver 35, and the one or more remote data communication terminals 60 preferably each include a second transceiver 65, 65′ for transmitting the second data communications protocol to the first transceiver 35 and receiving the second data communications protocol from the first transceiver 35. The second transceiver 65, 65′ is preferably similar to the first transceiver 35 as described herein above and accordingly for brevity will not be repeated herein.

[0044] The first and second transceivers 35, 35′, 65, 65′ also each include a signal processing physical layer. Advantageously, the second data communications protocol only uses the physical layer of the first and second transceivers 35, 65 for signal processing and not a data link layer (“DLL”) as understood by those skilled in the art. By only using the physical layer for signal processing, the data communications and coding or modulation schemes for the communications is greatly simplified and the data conversion from one data communications protocol to another data communications protocol is also simplified.

[0045] The remote data communications terminal 60 is preferably a computer, e.g., provided by a portable laptop or handheld computer, or other portable or substantially stationary remote data collection stations as understood by those skilled in the art. The remote data communications terminal 60 also includes remote data communications protocol converting means 63, e.g., preferably provided by a remote data communication protocol converter as illustrated by the third data communications protocol converter 69 and the second signal booster 66, for converting the second data communications protocol received by the remote data communications terminal to a third data communications protocol associated with the computer. The third data communications protocol, for example, can be RS-232, RS-422, RS-423 or other data communications protocol, as understood by those skilled in the art. If two conversions occur in the vehicle data converter 33, e.g., RS-485 to RS-232 and RS-232 to IrDA or RF, then the third data communications protocol would actually be yet a fourth data communications protocol as sequentially illustrated in FIGS. 5 and 10. The remote data communications protocol converting means 63, e.g., a remote data communications protocol converter, also preferably includes data signal boosting means, e.g., a second signal booster 66 similar to the first signal booster 36 as described above herein, for boosting the range of the signal between the remote data communications terminal 60 and the first transceiver 35 of the data communications apparatus 30 to thereby increase the effective range of transmission for which the apparatus 30 is anticipated to be used. The remote data communications terminal also preferably includes a predetermined data communications protocol transceiver 61, 61′, e.g., preferably provided by an RS-232 transceiver as understood by those skilled in the art, as a data communications interface to the personal computer 68 or other data terminal.

[0046] The data communications apparatus 30 according to the present invention preferably also includes at least one controller 45 connected to the at least one electronic subsystem 40 and the plurality of electrical connectors 38 for controlling data communications along the plurality of electrical conductors 38, e.g., to and from the electronic subsystem(s) 40. As understood by those skilled in the art, the controller 45 preferably includes a microprocessor or microcomputer operating under stored program control to perform various functions related to the monitoring and control of various electronic subsystems on either or both of the tractor 21 and trailer 25 or to the remote data communications terminals 60.

[0047] As set forth previously above, each electronic subsystem 40 to be controlled and/or monitored preferably includes signal generating means, e.g., preferably provided by a signal generator, connected to the controller 45 for generating a signal related to the operation of the vehicle 20. The controller 45, for example, produces or outputs a number of digital or analog output controls in the form of relay contact closures or other signals to either the subsystems or to the transceiver 35. The controller 45, for example, can also be an ABS controller which actuates control valves on the trailer 25 to control the brake chambers of the brakes associated with the trailer 25.

[0048] As illustrated in FIGS. 1-11, the present invention also includes methods of data communications associated with a heavy duty vehicle 20. The method preferably includes providing a plurality of electrical conductors 38 associated with a heavy duty vehicle 20 and converting a first vehicle data communications protocol associated with data communications along the plurality of electrical conductors 38 to a second data communications protocol. The method also includes transmitting the second data communications protocol from the heavy duty vehicle 20 to a remote data communications terminal 60. The first data communications protocol is preferably either SAE J1708 or SAE J1939. The second data communications protocol, on the other hand, is preferably one of either an infrared data communications protocol or an RF data communications protocol.

[0049] The method can also include receiving the second data communications protocol from the remote data communications terminal 60, controlling data communications along the plurality of electrical conductors 38, and generating a signal related to the operation of the vehicle 20. For example, the remote data communications terminal 60 can be a computer, and the method can include remotely converting the second data communications protocol received by the remote data communications terminal 60 to a third data communications protocol associated with the computer.

[0050] The method additionally can include positioning a connector 50 so as to be connected in series with the plurality of electrical conductors 38, positioning a transceiver 35 in association with the connector 50, detachably connecting a transceiver housing 34 to the connector 50, and positioning the transceiver 35 within the transceiver housing 34. The transceiver housing 34 preferably includes a translucent cover member 31 for transmitting and receiving the second data communications protocol therethrough.

[0051] The method can still further include providing at least one electronic subsystem 40 associated with the heavy duty vehicle 20 and connected to the plurality of electrical conductors 38 related to operation of the heavy duty vehicle 20. The transceiver 35 is preferably a first transceiver, and the remote data communication terminal 60 includes a second transceiver 65. The method also includes transmitting the second data communications protocol to the first transceiver 35 and receiving the second data communications protocol from the first transceiver 35. The first and second transceivers 35, 65 each preferably include a physical layer, and the method further includes transmitting and receiving the second data communications protocol only using the physical layer of the first and second transceivers 35, 65.

[0052] In the drawings and specification, there have been disclosed a typical preferred embodiment of the invention, and although specific terms are employed, the terms are used in a descriptive sense only and not for purposes of limitation. The invention has been described in considerable detail with specific reference to these illustrated embodiments. It will be apparent, however, that various modifications and changes can be made within the spirit and scope of the invention as described in the foregoing specification and as defined in the appended claims.