AU650393B2

AU650393B2 - Remote control security system

Info

Publication number: AU650393B2
Application number: AU47409/93A
Authority: AU
Inventors: Peter Hui Wen Sun
Original assignee: MONITOR CONTROL SECURITY SYSTE
Current assignee: MONITOR CONTROL SECURITY SYSTEMS Pty Ltd
Priority date: 1992-03-17
Filing date: 1993-09-16
Publication date: 1994-06-16
Anticipated expiration: 2013-03-17
Also published as: AU4740993A

Description

REMOTE CONTROL SECURITY SYSTEM The present invention relates to security systems for mobile or stationary articles or premises and, in particular, discloses an arrangement by which remote operation can be inexpensively, reliably and conveniently implemented.

There are a large number of security and alarm systems available in the market place adapted for many different circumstances. Consumer based alarm systems are however generally limited to household security systems and motor vehicle security systems. In particular, with motor vehicle alarm systems, there exists a significant problem in that, if the alarm system is defeated by a thief, the motor vehicle may be removed from its location making its recovery at best difficult, and often uneconomical or impossible.

It is an object of the present invention to provide a security system which substantially overcomes or ameliorates at least some problems associated with prior art systems.

In accordance with one aspect of the present invention there is disclosed a security system for lessening the effects of theft or unauthorised use of an article, said system comprising: transmit means arranged at a fixed location for transmitting a radio frequency 0oo signal adapted to be received by a receiver means located within said article; 20 control means associated with said receiver means within said article for interpreting 00i0 o information carried by said signal and output from said receiver means, whereby 0000 0 a predetermined interpretation of said information causes said control means to o 0- actuate one or more devices located within or about said article to lessen the effects of a :0* Soo0o suspected or attempted theft or unauthorised use of said article at or about a time at which said signal is received.

009 In accordance with another aspect of the present invention there is disclosed a security system for a motor vehicle, said system comprising: a primary security arrangement comprising 0 -a transmitter arranged at a fixed location for transmitting radio frequency 0000 .0000 30 signals; r o -a radio frequency receiver means configured in said motor vehicle for *o 0reception of said radio frequency signals from said transmitter and decoding of a 0000 particular one of said signals intended for reception by said receiver means; and 0 a centrol means connected to said receiver means for ipterpreting S0 o 35 information carried by said particular signal, whereby a predetermined interpretation of 0-00 said information causes said control means to actuate one or more primary devices located within or about said motor vehicle substantially simultaneously upon receipt of said particular signal, said primary device(s) acting to lessen the effects of a suspected or ALI.I attempted theft or unauthorised use of said motor vehicle.

S, n:\UB O 43:IAD [nA\LIB00100043IAD A preferred embodiment of the present invention will now be described w'th reference to the drawings in which: Fig. 1 is a schematic illustration of a remote control security system of the preferred embodiment; Fig. 2 is a schematic block diagram representation of the security circuits configured within the motor vehicle of Fig. 1; Fig. 3 is a schematic circuit representation of the pager alarm controller of Fig. 2; Fig. 4 shows the coding arrangement for the function routines; Fig. 5 is a flow diagram illustrating the method of handling pager messages; Fig. 6 is a flow diagram illustrating the emergency mode; Fig. 7 is a flow diagram illustrating the disable mode; Fig. 8 is a flow diagram of the disarm mode; and S jFig. 9 is a flow diagram of the test mode.

i t i ,1 t 4 t i 2 Shown in Fig. 1 is a remote control security system 1 in which it is desired to protect a motor vehicle 2 from theft or tampering. The motor vehicle 2 is configured with a standard alarm system as known in the art and if this alarm system fails or is defeated and the car 2 is removed from its parked location, the owner of the vehicle 2 is able to actuate the remote control security system 1 by means of a telephone 3.

The telephone 3 forms part of a public telephone network by which the owner may place a call to a telephone exchange 4 which links to a radio paging network 5 by which a paging ignal can be transmitted to the motor vehicle 2. In this embodiment, the telephone exchange 4 links to a ground station 6 which acts to transmit a communications signal to a satellite repeater station 7 (eg.satellite transmitter etc.) which thereby re-transmits a radio paging signal. It will be appreciated by those skilled in the art that other configurations for transmitting the radio pager signal can be used such as localised pager transmitters, cellular transmitters and the like which can be distributed around a city for example. Furthermore, depending on the size of the public telephone network, remote control and transmission of the radio paging signal can be implemented from any telephone 3 anywhere within the network. In this manner, if an owner of the vehicle were to travel overseas having left their motor vehicle parked in front of the their home and subsequently learns, from a neighbour for example, that the motor vehicle has been stolen, the remote control security system 1 can be implemented from an international location by means of the owner calling a pager receiver located within the motor vehicle 2.

Turning now to Fig. 2, the security systems arranged within the motor vehicle 2 are shown. The motor vehicle 2 includes a standard alarm controller 10 of the type well known in the art which is configured as a primary level of defence against theft.

Connected to the controller 10 is a movement sensor 11 such as an ultrasonic arrangement, bonnet and trunk sensors 12 and door sensors 13, all of which are configured to actuate the standard alarm 10 upon unauthorised entry of the motor vehicle when the standard alarm controller 10 is enabled.

The enabling and disabling of the standard alarm controller 10 can be performed using a portable remote control device carried by an authorised user which transmits a signal to a receiver 14 which communicates with a controller 10. If an unauthorised intrusion is detected, the standard alarm controller 10 is often configured to sound a siren 15, flash the lights 16 of the motor vehicle as well as to kill the ignition 17, thereby preventing operation of the engine and hence hampering removal of the motor 35 vehicle from the scene of the theft.

However, it has been found in industry and in practice that the ability of the standard alarm to prevent theft is limited predominantly by its manner of installation and the familiarity by which a thief has with a particular alarm system.

In:LIB00100043:IAU ii., Cj I I~ C~ Ii C Ii

I

U i U Ic Y rL i I i i 2A In the preferred embodiment, the motor vehicle 2 includes a secondary level of protection implemented by the remote control security system 1 and which incorporates a pager alarm system 20 included within the motor vehicle 2. The system 20 includes a radio pager receiver 22 and an associated antenna 21 which is configured to receive radio paging signals transmitted by the paging network 5 of Fig. 1. As illustrated in Figs. 1 and 2, the antenna 21 can comprise a standard AM/FM radio receiving antenna 4~ 4

U,

(II I

I

4 4 I, Cc 4 44 4 4

~I.

commonly provided with motor vehicles. This arrangement has the advantage of not alluding the thief tc the existence of pager alarm system. Alternatively, a separate antenna 21 can be provided for the radio pager receiver 22 which can be configured discreetly about the motor vehicle 2.

The radio pager receiver 22 is configured to receive all address signals transmitted by the network 5 and when a matching address is decoded, indicative of the particular radio pager receiver 22, a message signal is received which in the preferred embodiment comprises a personal identification number (PIN) and a function code which are output to a pager alarm controller 30. The controller 30 is configured to examine the PIN and 10 if a match occurs with the PIN of the alarm controller 30, the functi'n code is enabled 0000 whereby the function code directs the controller 30 to perform various security or other 0::o 0 service functions designed to overcome or ameliorate the theft of the motor vehicle 2.

o: o Those functions can be a variety of functions either implemented individually or in a oono predetermined combiuation to achieve a desired result. For example, the pager alarm 0 15 system 20 includes a siren 24 directly connected to the controller 30 which can be 000 aot enabled to sound upon receipt of an appropriate function code. In a similar manner, a bonnet lock 25 can be enabled to lock the bonnet of the car thereby preventing access to the engine bay by the thief. Similarly, a central locking controller 26 can be enabled to 0 lock the motor vehicle 2 thereby preventing escape of the thief preferably held within.

S° 20 In addition, the pager alarm system 20 includes a speed sensor 23 which provides 00 D speed inputs to the controller 30 so that the controller 30 can determine from the motor 000 vehicle speed certain steps that are to be taken to disable the motor vehicle thereby 00 0 o preventing its removal by a substantial distance from the scene of the theft. This can be achieved in a number of ways. Firstly, the alarm controller 30, having determined that the motor vehicle is proceeding at speed, can act to inhibit the ignition 17 of the motor vehicle thereby causing the motor vehicle to progressively slow down but maintain 0: °*operation of the motor vehicle engine thereby permitting continued operation of power steering and power assisted brakes thereby allowing the intruder to safely control the motor vehicle 2 until such time as it is stopped. Preferably, when the sensed speed falls below a predetermined minimum, for example 10 kph, the ignition 17 is killed thereby disabling the motor vehicle from further operat on. In addition to the inhibition and killing of the ignition 17, a corresponding operation can be applied alternatively or additionally to the fuel pump 27 of the motor vehicle 2, particularly after the motor vehicle has stopped thereby preventing re-starting of the engine at a later time.

Depending on the desired operation, the alarm controller 30 can be configured to, once having killed the ignition 17, to enable each of the bonnet lock 25, the central locking 26 and disable the fuel pump 27 thereby totally disabling the car and hopefully confining the thief within the motor vehicle 2, and then sounding the siren 24 to draw attention to the plight of the motor vehicle 2 and the thief therewithin.

[N:\LIBOOl00043:STA 4 As seen in Fig. 2, the alarm controller 30 can also be connected to the lights 16 of the motor vehicle 2 which can be configured to flash or otherwise operate to draw attention to the theft. This can occur whilst the motor vehicle is being operated and slowing down so as to draw other driver's attention to a potential hazard on the road.

Furthermore, as illustrated in Fig. 2 the alarm controller 30 can be coupled to the standard alarm controller 10 to permit operation of the siren 15 where possible.

Generally however, it is preferred that the alarm controller has separate actuators upon the other sections of the motor vehicle, such as the lights 16 and ignition 17 from those actuated by the alarm controller 10 thereby permitting operation of those components even if the standard alarm controller 10 is disabled.

0 0 Turning now to Fig. 3, the configuration of the pager alarm controller 30 is shown o 0 which includes a power supply 32 being connected 31 to a 12 volt supply provided within the motor vehicle 2. The power supply 32 includes an integrally re-charged 0 battery 33 which permits operation of the pager alarm controller 30 in the event that the motor vehicle battery is disconnected. The power supply 32 supplies an output voltage V1, typically 5 volts to various components within the controller 30 as well as a further output voltage V2, typically 1.5 volts, to the radio pager receiver 22.

The radio pager receiver 22 can be a standard paging receiver such as the NEC R3N2, 12AID, 124NA, or 12A and through the provision of the supply voltage V2 thereto, can operate continuously (24 hours per day) without the need for an internal 0" 0 0 battery supply. The pager receiver 22 connects via a connector 34 to the pager alarm controller 30. As the pager 22 is provided with a standard pager address and when a 0° 0 match of that address is obtained, data following the address is then transferred from the pager receiver 22 to the alarm controller 30. That data can be derived directly from a communications output of the pager receiver 22 where provided, or by coupling directly the processor or display therewithin. As shown in Fig. 3, this is provided by means of a parallel data input DO-D7 which communicates various identification codes and a three bit function code F1-F3 which identifies the function by which the pager alarm controller is to operate, both of which connect to an input buffer 35. The input buffer 35 is interconnected to a microcontroller 36 by a data bus 55 and an address bus 56. A synchronisation signal SYNC can also be provided from the pager receiver 22 direct to the microcontroller 36 so as to permit synchronisation of the receipt of the message signal from the pager receiver 22. Upon receipt of the message signal, this can be either stored within the input buffer 35 or transferred via the data bus 55 into random access memory within the microcontroller 36.

A local code latch 37 is provided having a number of code pin connectors 39 which facilitate the owner of the motor vehicle 2, to enter a PIN code, in this case 01011001 which is necessary for the activation of the page: alarm system 20. Similarly provided is a fleet code latch 38 which permits a fleet opel 'tor or the like to insert a -0 further code 01101111) having similar operation. The microcontroller 36 is [N:\LIBOO1OO,43:STA configured to compare each of the codes provided by the code pin connectors 39 with the code(s) received by the input D0-D7. If the a match occurs, the function codes FI1-F3 are transferred from the input buffer 35 to the microcontroller 36 to enable alarm operation of same.

Whilst Fig. 3 illustrates the use of latches 37, 38 and code pin connectors 39 to provide the various PIN codes, those skilled in the art will appreciate that ROM, EPROM and E 2 PROM devices can be used in an equivalent manner.

The microcontroller 36 further includes ROM (not illustrated) into which a controlling program of the pager alarm system 20 is provided. Furthermore the ROM etc. that substitutes for the latches 37, 38 and code pin connectors 39 can also include the controlling program, or part thereof. The microcontroller 36 connects via the data bus 55 and an address bus 56 to an output latch 40 which permits coupling of various output signals via buffers 41 to the various devices distributed about the motor vehicle 2 as previously discussed.

As also seen in Fig. 3, the microcontroller includes the three interrupt inputs INT1, INT2 and INT3. INT1 is connected to the sensor 13 for the doors of the motor vehicle 2 and operates to indicate to the microcontroller 36 the status of the doors being either open or closed.

A second interrupt input INT2 is supplied with a voltage from a "zero speed" detector circuit 42. The circuit 42 includes an input 43 from a "zero speed" output of the speed sensor 23 which supplies a resistor divider network formed of three resistors 44,45 and 46. When the voltage at the input 43 falls below a predetermined value, INT2 goes low indicating that the motor vehicle 2 is at substantially zero speed. At this time, the microcontroller 36 outputs signals to the output latch 40 that are arranged to kill the ignition 17 of the motor vehicle 2.

A third interrupt input INT3 is supplied from a variable speed detector circuit 47.

The circuit 47 includes a variable speed sensor input 48 derived from the speed sensor 23 which supplies a comparator 49. The comparator 49 is associated with a resistor divider network formed of resistors 50, 51 and 52 which compares the voltage on the input 48 against a predetermined voltage from the resistor divider formed of resistors and 51. If the voltage at the input 48 is higher than that of the predetermined voltage, ALA INT3 is enabled indicating that the motor vehicle 2 is travelling at speed. In this configuration, the microcontroller 3t, can issue commands via the output latch 40 so as to inhibit the ignition 17 of the motor vehicle 2.

'The ignition output 53 of the controller 30 is generally connected to a relay across the input terminals of the ignition coil of the motor vehicle 2. When activated, the relay acts to short-out the input terminal thereby preventing sparking of the engine. In a "kill" mode, the relay is permanently enabled. However, in the inhibit mode the microcontroller 36 implements a timed sequence for a period of two minutes whereby the relay is enabled for a period of four seconds and then disabled for a period of one IN:\LIBO0100043:STA LU'C- L i 6 second thereby permitting the motor vehicle engine to operate for one second in every five. This has the effect of causing the motor vehicle to progressively slow down whilst maintaining revolutions of the motor sufficient to operate power steering and brakes and other essential safety equipment. Once zero speed is detected by the circuit 42, the relay is permanently enabled thereby killing the ignition of the engine. Those skilled in the art will appreciate that other inhibit ratios can be used but generally a ratio of greater than or equal to 2:1 is necessary to ensure that the motor vehicle 2 eventually ceases to move.

Shown in Fig. 4 is a bit table for the various function routines which are each illustrated in Figs. 5 to 9.

Fig. 5 shows the normally operating main program of the microcontroller 36 which, having been powered on and initialised awaits receipt of a pager message from the pager receiver 22. Once a pager message is received, the message is decoded firs, by comparison with the local code stored in the latch 37 and optionally followed by examining the fleet code stored in the latch 38. If there is no match, the system awaits receipt of the next pager message. If an appropriate match is obtained, the function code is decoded indicating the function required from the pager alarm controller "Emergency mode" as shown in Fig. 6 indicates those various actions taken when an outright theft is suspected. Initially, the bonnet lock 25 is enabled together with the central locking 26 thereby securing the motor vehicle 2 and any thieves therewithin.

Next, the lights 16 are flashed so as to draw attention to the motor vehicle 2. Next, having examined the speed either the ignition inhibit sequence is commenced or the ignition is killed. Once the motor vehicle 2 is stationary, with the ignition being killed, the siren 24 is sounded and the system 20 awaits the receipt of the disarm mode.

The "disarm mode" is illustrated in Fig. 8 where all the protective features of the paging alarm 20 are disabled and operation of the motor vehicle 2 is thereafter permitted.

Shown in Fig. 7 is a "disable mode" whereby the paging alarm controller 30 is operated to indicate to a would-be thief that the car is disfunctional to such an extent that the thief will leave the motor vehicle 2. This mode is provided as an alternative to a possible situation which may be experienced in the emergency mode whereby if a thief is trapped within the motor vehicle 2, the thief may be inclined to cause damage to the motor vehicle 2 or inflict personal injury upon himself or others. In the disable mode, there is no overt indication to the thief that the car is under an alarm control. Although the bonnet lock 25 is enabled, central locking 26 is disabled thereby permitting the thief to escape from the motor vehicle 2. Furthermore, there are no overt indicators such as sirens or flashing lights that would indicate to the thief that a car alarm has been enabled. Once, being given the opportunity for escape, provided by a 5 minute delay, the central locking 26 is enable thereby acting to prevent further unauthorised entry.

Fig. 9 shows an example of a test mode whereby each of the features of the pager alarm system 20 are tested. The test is preferably implemented when the car is [N:\ULBOO100043:STA stationery with the engine running. Firstly, upon receipt of the test mode pager message, procedures corresponding to the disarm sequence of Fig. 8 are implemented.

Next, of the siren 24, flashing lights 16 and bonnet lock 25 are enabled periodically in such a manner so as to permit an observer of the motor vehicle 2 to note each of the alarm functions sequentially.

After the bonnet lock test, the ignition disable test is performed with a varied disable ratio compared with that of the emergency and disable modes. In this manner, the continued operation of the engine at idle is permitted yet an observer can note a change in engine operation corresponding to the disabling of the ignition 17. For different types of engines, the disabling time can be varied so as to ensure that the engine does not stall. Having completed the disable ignition test, an inhibition of the fuel supply is performed in a manner corresponding to the ignition test. Again, the time periods can be altered as necessary to suit certain motor vehicles. Once the fuel test is completed, the ignition is killed which should therefore stall the motor vehicle engine.

Subsequent to a 15 second pause, the disarm mode is performed thereafter permitting further operation of the motor vehicle 2.

The security system 1, although having been described with reference to a motor vehicle 2, can be applied to other vehicles such as boats, as well as stationery situations such as safes. Furthermore, in motor vehicle applications, the system 1 addresses the significant problem of so-called "joy-ride" theft where there is no significant desire to cause damage to the motor vehicle, but however presents a substantial danger in terms of high speed police pursuits. With a system according to the present invention, the motor vehicle can be brought to a contiolled stop without causing substantial damage or injury.

The foregoing describes only one embodiment of the present invention and modifications, obvious to those skilled in the art can be made thereto without departing from the scope of the present invention.

For example, the pager alarm system 20 can be supplemented by inclusion of a radio frequency transmitter which can be enabled in a similar manner to the siren 24 for example to transmit a location code which permits locating the motor vehicle subsequent to its abandonment by any thieves. Also those skilled in the art will appreciate that a large number of permutations and combinations of the specific functions can be implemented according to desired practices.

Furthermore, whilst only activation by means of a public telephone and pager system has been described, other forms of radio frequency activation can be used, for example by fleet operators having a designated operating waveband. In such an embodiment, the address component of the transmission can be omitted.

In addition, whilst operation of the ignition 17 can be manipulated to cause intermittent operation of an internal combustion prime mover, other prime movers, such as electric motors for electric cars can be manipulated in similar ways.

[N:\LIBOO]00043:STA Also, the disable mode can he adapted specifically for use by fleet controllers to disable the operation of a motor vehicle outside of normal business hours. Private users can utilize the same function to prevent motor vehile operation by younger family members whilst the vehicle owner is absent.

tt r tk f yI i a if

I

4

'I

W

1 j'j [N :'IB00100043:STA i

Claims

1. A security system for lessening the effects of theft or unauthorised use of an article, said system comprising: transmit means arranged at a fixed location for transmitting a radio frequency signal adapted to be received by a receiver means located within said article; control means associated with said receiver means within said article for interpreting information carried by said signal and output from said receiver means, whereby a predetermined interpretation of said information causes said control means to 10 actuate one or more devices located within or about said article to lessen the effects of a suspected or attempted theft or unauthorised use of said article at or about a time at i which said signal is received.

2. A system as claimed in claim 1 wherein said transmit means comprises a I radio paging transmitter, s.id receiver means comprises a radio pager receiver, and said signal is a radio pager signal.

S3. A system as claimed in claim 2, wherein said radio paging transmitter is supplied with said information from a public telephone network.

4. A system as claimed in claim 3, wherein said information is sourced from a telephone handset automatically connectable to said radio paging transmitter by a telephone exchange of said network.

A system as claimed in any one of the preceding claims, wherein said information comprises a transmitted security code examinable by said control means for a match with an internal security code integrated with said control means, whereby if a match occurs between said codes, said match comprises at least part of said predetermined interpretation.

6. A system as claimed in any one of the preceding claims, wherein said information comprises one or more function codes, each said function code being subjected to a particular predetermined interpretation thereof by said control means.

7. A system as claimed in claim 6, when dependant on claims 2 and wherein said transmitted security code and said function code(s) are included in a SI message component of said pager signal.

8. A system as claimed in claim 6 or 7, wherein said function codes are selected from the group comprising: an emergency mode configured for interpretation by said control means to cause cessation of operation of said article; a disable mode configured for interpretation by said control means to prevent operation of said article; a disarm mode configured for interpretation by said control means to S enable operation of said article; and [n:\LIBOOJ00043:IAD 0EI PE 0\ 1 a test mode configured for interpretation by said control means to permit testing and evaluation of said system.

9. A system as claimed in claim 5, 6 or 7, wherein said security code comprises multiple components which are configurable to permit a plurality of said receiver means to receive a common signal and thereafter a like plurality of said control means to operate independently or in concert.

A system as claimed in claim 8 when dependent on claim 7, wherein said disable mode function code is transmissible to a plurality of said receiver means configured in a like plurality of said articles to selectively prevent operation of said articles until such time as an enable mode function code is received.

11. A system as claimed in any one of the preceding claims, wherein a (first) one of said devices is actuable to deprive said article of an energy source required to operate same, said energy source being selected from the group consisting of liquid fuel and electricity.

12. A system as claimed in any one of the preceding claims wherein said article is a motor vehicle, and a (second) one of said devices is actuable to cause intermittent operation of a prime mover of said motor vehicle and thereby causing a cessation of operation of same.

13. A system as claimed in claim 12, wherein said second device is initially 20 actuated to cause intermittent operation of said prime mover until a speed of said motor vehicle falls below a predetermined amount and thereafter said second device is actuated to cease operation of said prime mover.

14. A system as claimed in claim 13, wherein said second device comprises an ignition control circuit of an internal combustion engine.

15. A system as claimed in claim 11 or 12, wherein said first or second device respectively is a fuel pumn.

16. A system as claimed in any one of the preceding claims, wherein a (third) one of said devices prevents access into said article.

17. A system as claimed in claim 16 when dependent on claim 12, wherein 30 said third device comprises means for actuating a central door locking and/or a bonnet S locking device of said motor vehicle. o

18. An article protected by a security system as claimed in any one of the preceding claims.

19. A security system for a motor vehicle, said system comprising: a primary security arrangement comprising S. -a transmitter arrapged at a fixed location for transmitting radio frequency signals; a radio frequency receiver means configured in said motor vehicle for L reception of said radio frequency signals from said transmitter and decoding of a 0 particulat one of said signals intended for reception by said receiver means; and I£ nA\UBOO]0004V:AD 0 ,o ,uoo~oo o 11 a control means connected to said receiver means for interpreting information carried by said particular signal, whereby a predetermined interpretation of said information causes said control means to actuate one or more primary devices located within or about said motor vehicle substantially simultaneously upon receipt of said particular signal, said primary device(s) acting to lessen the effects of a suspected or attempted theft or unauthorised use of said motor vehicle.

A security system as claimed in claim 19, said system further comprising: a secondary security arrangement configured for surveillance of said motor vehicle and arranged to detect unauthorised access, use or theft of said motor vehicle and to actuate one or more secondary devices locatnd within or about said motor vehicle, said secondary devices acting to lessen the effects of said unauthorised access, use or theft.

21. A security system as claimed in claim 20, wherein one or more of said primary and secondary devices are common to both said arrangements.

22. A security system as claimed in claim 20, wherein one or more of said primary and secondary devices act in a like manner to lessen said effects.

23. A security system as claimed in any one of claims 20 to 22, wherein said devices are selected from the group consisting of: an ignition control means for a prime mover of said motor vehicle; an energy source control means for a prime mover of said motor vehicle; an audible alarm; V a visual alarm; and a central door locking device.

24. A security system as claimed in any one of claims 20 to 23, wherein said secondary security arrangement further comprises operating means for enabling and disabling surveillance operation of said secondary security arrangement on exit and entry respectively by an authorised user of said motor vehicle. A security system as claimed in claim 24, wherein said operating means comprises a localised transmitter carried by said user and a complementary receiver in S said secondary security arrangement, said localised transmitter being actuable to cause enabling and disabling of said surveillance.

J

26. A security system as claimed in any one of claims 19 to 25, wherein said receiver means is a radio pager receiver, said particular signal is a radio paging signal addressed to said radio pager receiver and sourced from a radio paging transmitter accessible via a public telephone network.

27. A security system as claimed in any one of claims 20 to 26, wherein said arrangements are interconnected whereby said secondary devices can be actuated by said 1 primary arrangement and/or said primary devices can be actuated by said secondary 4Q arrangement. f n:%LIBOO]OOO43:IAD SV -2i- I~ i i rrri~- in 12

28. A motor vehicle comprising a security system as claimed in any one of claims 19 to 27.

29. A security system substantially as described herein with reference to the drawings. Dated this Sixth Day of April 1994 Monitor Control Security Systems Pty Limited Patent Attorneys for the Applicant SPRUSON AND FERGUSON i I i 4 4 4 '4 4- *441 44 4 4 4 4 4I [n:\LIB0100043:IAD ii