EP0782740A1 - Überwachungsvorrichtung für rechner mit angeschlossenen geräten wie monitor, drucker oder dergleichen - Google Patents
Überwachungsvorrichtung für rechner mit angeschlossenen geräten wie monitor, drucker oder dergleichenInfo
- Publication number
- EP0782740A1 EP0782740A1 EP95929871A EP95929871A EP0782740A1 EP 0782740 A1 EP0782740 A1 EP 0782740A1 EP 95929871 A EP95929871 A EP 95929871A EP 95929871 A EP95929871 A EP 95929871A EP 0782740 A1 EP0782740 A1 EP 0782740A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- computer
- monitoring
- sensor device
- alarm
- ground connection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
- G08B13/1409—Mechanical actuation by lifting or attempted removal of hand-portable articles for removal detection of electrical appliances by detecting their physical disconnection from an electrical system, e.g. using a switch incorporated in the plug connector
- G08B13/1418—Removal detected by failure in electrical connection between the appliance and a control centre, home control panel or a power supply
Definitions
- Monitoring device for computers with connected devices such as monitors, printers or the like
- the invention relates to a monitoring device for computers with connected devices such as monitors, printers or the like, wherein all devices are each connected to the computer via at least one ground line.
- Such a monitoring device is known from DE-GM 91 10 174.
- this monitoring device which is referred to as the anti-theft device, at least one transmitter emitting light signals and a receiver assigned to the transmitter and receiving the light signals emitted by the transmitter are provided, an optical waveguide connecting the transmitter and the receiver to one another being additionally implemented as a locking element.
- the optical waveguide is constructed in several parts, the respective parts of the optical waveguide being releasably connected to one another via coupling pieces and coupling counterparts. In this way, a large number of devices, such as a computer with a connected monitor, printer or the like, can be connected to one another via the multi-part optical waveguide provided as a locking element, ie can be linked to one another and thus protected against theft.
- a device for theft protection of computers with a sensor unit which comprises a computer-side and a stationary sensor device, which are electrically connected to one another in the puncture position.
- the stationary sensor device is advantageously a line which has a contact point on one side and a loop on the other side, which can be placed around a stationary part, such as a table leg or a shelf rail. An alarm signal is generated when the line is cut, the plug connection is disconnected or the like.
- the known devices are more or less only suitable for monitoring the computer, while the normally connected devices such as monitors, printers or the like cannot be monitored or stolen (cf. DE-GM 93 11 034).
- the known generic monitoring device in the form of a multi-part optical waveguide is designed to be extremely complex. - This is where the invention begins.
- the invention has for its object to provide a monitoring device of the embodiment described above, which is simple and reliable.
- each ground line or any ground line has a sensor device inserted between the device and the computer for monitoring a continuous ground connection, the sensor device for registering
- Deviations of the electrical potential at the respective loop-in end of the sensor device are set up from the ground potential, and that an alarm device which can be activated by the sensor device when a deviation is registered is provided for reporting an interrupted ground connection.
- the monitoring device is suitable for any devices and types of computers.
- the function of the computer and the connected devices is not impaired in any way, since the mass connection to be measured naturally has no voltage-carrying potential, and consequently there is no fear of a disturbance in the data flow between the devices or between the computer and the devices.
- the sensor device is used for registration, ie for measuring and / or (temporarily) storing deviations of the electrical potential at the respective loop-in end of the sensor device from the ground potential. In this way, successful monitoring can also take place if the connection between sensor device and alarm device u. U. is disturbed. In any case, reliable monitoring of one or more computers with respectively connected devices is possible in a simple and functionally reliable manner.
- the sensor device is arranged as a plug-in device between the computer and the respective device, for. B. is formed as an attached to the associated output of the computer adapter.
- the invention is based on the knowledge that the computer to be monitored is generally connected to the devices connected to it by standard cables, with standard plugs or sockets with a standardized number of poles at the ends or devices (2. B. 9-pin, 1-pin, 25-pin) etc.) can be used for serial or parallel data transmission. In any case, it is possible in this way to insert the sensor device as an adapter between the computer and the connecting cable for the device to be connected.
- the sensor device preferably has a computer-side input and a device-side input at the respective loop-in end and is set up to register deviations of one input or both inputs from the ground potential, at least one additional ground connection as reference potential and one operating voltage connection for supplying power to the sensor device and an output connection to the alarm device for .
- Message of an interrupted ground connection are provided.
- the output connection to the alarm device is designed as a cable led out of the adapter plug.
- This multi-core cable can also be used to supply the sensor device with voltage from the alarm device.
- the operating voltage connection and the ground connection to be established on the computer side by connecting the connection socket or plug on the computer and the intermediate plug.
- a battery - buffered during computer operation - can also be provided for the mains-independent power supply.
- This battery - there can of course also be several batteries - can be arranged, for example, together with the alarm device in a housing from which the sensor device is supplied with power in this case.
- Such a mains-independent power supply proves to be advantageous if monitoring of the computer or computers with connected devices should be necessary even when the mains plug is pulled.
- the sensor device for monitoring a continuous ground connection preferably has an analog quiescent current loop monitor or a digital signal shape monitor which is fed into an additional signal input of the sensor device and, with a continuous ground connection, is phase-shifted, in particular negated, rectangular signal.
- the digital waveform monitor of a (negated) square-wave signal a low one Power consumption of the sensor seal enabled by the CMOS components that can be used here.
- no adjustment of the waveform monitor is necessary and there are also no shifts in the operating point due to temperature drift, so that a continuous ground connection can be determined independently of this in a defined manner.
- Both the closed-circuit current monitor and the waveform monitor can be installed in this adapter if the sensor device is designed as an adapter.
- the sensor device designed in this way is no longer accessible. This applies all the more in the event that the adapter plug has a cast envelope and consequently can no longer be opened. In any case, tampering with the sensor device can be successfully prevented in this way. This also applies to the alarm device if it is designed as an alarm card with an adjustable alarm duration that can be inserted into the computer. Because now the alarm device is no longer accessible when the computer housing is closed.
- the alarm device can also be connected to one of the computers and the closed devices are monitored from a distant location and are connected, for example, to the sensor device via a telephone line.
- a wireless connection of the sensor device to the alarm device integrated in an existing alarm system is also possible.
- remote monitoring of the computer or computers with connected devices can also be carried out altogether, for example by using a telephone line or a wireless connection between the sensor device and the alarm device.
- an operating device which in the simplest case is preferably designed as a key switch with an associated LED for indicating the key switch position.
- Such an operating device is suitable for monitoring a computer with connected devices. If several computers with respectively connected devices, ie an entire office complex, are to be monitored, an operating device is provided which is designed as a programmable operating unit for activating and deactivating one or more alarm devices. In this way, one or more alarm devices can be specifically addressed, ie activated and deactivated.
- the computer In addition to monitoring the connection of a computer to a connected device, the computer itself can also be monitored for opening the housing, provided that the computer has a two-part metal housing with a ground line between the two housing parts. This is done in such a way that the ground line has an additional sensor device that is looped in between the two housing parts for monitoring a continuous ground connection between the two housing parts, the alarm device for reporting an interrupted ground line being activatable by the additional sensor device.
- spring contacts or the like which are triggered when the housing is opened, can also be used for this purpose.
- this removable hard disk can also be monitored for unauthorized removal by monitoring the ground connection which is necessarily present between the removable hard disk and the computer.
- the Masseleitun ⁇ between the removable hard disk and the computer has a looped-in additional sensor device for monitoring a continuous ground connection between the removable hard disk and the computer, the alarm device for reporting an interrupted ground connection can be activated by the additional sensor device.
- the latter two measures enable the computer to be monitored against opening the housing and pulling out a removable hard disk, regardless of whether the computer with the connected devices such as a monitor or printer or the like is connected or not. It goes without saying that other built-in parts such as streamers, CD-ROM drives or the like - similar to the removable hard disk - can be secured by means of the monitoring device according to the invention.
- 1 is a monitoring device for a computer with removable hard disk and connected monitor and printer
- FIG. 2 shows a sensor device in the form of a closed-circuit loop monitor
- Fi. 3 shows a sensor device designed as a waveform monitor.
- a monitoring device for a computer 1 with a removable hard disk 2 and a connected monitor 3 and printer 4 is shown. All devices 3, 4 - like the removable hard disk 2 - are each connected to the computer 1 via a ground line 5.
- a respective ground connection 6 is provided as a reference potential.
- Each ground line 5 has a sensor device 7 looped in between the device 3, 4 and the computer 1 for monitoring a continuous ground connection, the sensor device 7 for registering deviations of the electrical potential at the respective loop-in end of the sensor device 7 is set up from the ground potential, and an alarm device B which can be activated by the sensor device 7 when a deviation is registered is provided for reporting an interrupted ground connection.
- the sensor device 7 is designed as an intermediate connector 7 which is plugged onto the associated output of the computer 1.
- the sensor device or the intermediate connector 7 has a computer-side input E and a device-side input E_ at the respective loop-in end and is used to register deviations of an input E, E, or both inputs E, and E_ from the ground potential directs, an operating voltage connection 9 for the power supply of the intermediate connector 7 and an output connection 10 with the alarm device 8 for reporting an interrupted ground connection are additionally provided.
- the alarm device 8 is designed as an alarm plug-in card 8 which can be inserted into the computer 1 and has an adjustable alarm duration. A battery (albeit not shown) is provided on the alarm plug-in card 8 for the mains-independent power supply of the monitoring device.
- the activation and deactivation of the alarm plug-in card 8 is carried out by an operating device 11 designed as a key switch 11.
- An operating device 11 designed as a programmable operating unit for activating and deactivating one or more alarm devices 8 can also be provided. However, this is not shown.
- the computer 1 has a two-part metal housing with a ground line 5 between the two housing parts.
- This ground line 5 has an additional sensor device 7 which is looped in between the two housing parts for monitoring a continuous ground connection between the two housing parts, the alarm plug-in card 8 also being able to be activated by this additional sensor device 7 for reporting an interrupted ground connection.
- a tilt switch can also be attached to the alarm plug-in card 8 or to the housing parts, which detects the opening of the metal housing and / or the removal of the entire computer 1. However, this is not shown.
- the sensor device 7 which is designed as a closed-circuit loop monitor in FIG. 2, is explained below.
- the sensor device 7 or the closed-circuit loop monitor depicted here has an additional ground connection 6 as a reference potential, an operating voltage connection 9 for supplying power to the sensor device 7 and an output connection 10 with the one not shown in FIG. 2 Alarm plug-in card 8 to report an interrupted ground connection between E 1 and the computer 1 and / or E and the monitor 3 or printer 4. If both inputs E, and E 2 are kept at ground potential, ie
- the output connection 10 is pulled to ground potential, so that the alarm plug-in card detects the change in potential from the operating voltage potential to ground potential and triggers a corresponding alarm.
- the same effect occurs when the operating voltage connection 9 is interrupted. In this case too, the output connection 10 is pulled to ground potential, so that the alarm plug-in card 8 reacts.
- FIG. 3 shows another variant of the sensor device 7, which is designed as a signal shape monitor of a square-wave signal fed into an additional signal input 12 of the sensor device 7 and negated with a continuous ground connection.
- the mode of operation is explained below.
- At the heart of the waveform monitor are three controllable switches A, B and C, which are commercially available in the form of an integrated circuit. If both inputs E ⁇ and E 2 are at ground potential
- switches A and B lie, ie there is a continuous ground connection between computer 1 and monitor 3 or printer 4, the control inputs of switches A and B are also at ground potential, so that both switches A and B - as shown - are open.
- the square wave signal fed in via the additional signal input 12 consequently controls - via the resistor R_ - the control input of the switch C, which is opened and closed and thus transmits the negated square wave signal to the alarm plug-in card 8 via the output connection 10. In this case there is no alarm.
- switch A and / or B is closed because its control input has a positive potential receives from the operating voltage connection 9 via the resistor R ,, R_.
- switch C is also closed and no longer opened and closed in alternation of the square-wave signal. Consequently, the output connection 10 is at ground potential, so that the alarm plug-in card 8 triggers an alarm.
- the opposite phase position of the square-wave signal which is fed into the additional signal input 12 on the input side, compared to the square-wave signal on the output side, which is transmitted to the alarm plug-in card 8 via the output connection 10 with a continuous ground connection, prevents a continuous connection in the event of manipulations at the output connection 10 Mass connection can be simulated.
- the negated square-wave signal can in turn be negated during further processing, so that it can then be checked whether the input-side square-wave signal corresponds to the (twice negated) output signal.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
- Alarm Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4432676A DE4432676A1 (de) | 1994-09-14 | 1994-09-14 | Überwachungsvorrichtung für Rechner mit angeschlossenen Geräten wie Monitor, Drucker oder dergleichen |
DE4432676 | 1994-09-14 | ||
PCT/EP1995/003225 WO1996008800A1 (de) | 1994-09-14 | 1995-08-16 | Überwachungsvorrichtung für rechner mit angeschlossenen geräten wie monitor, drucker oder dergleichen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0782740A1 true EP0782740A1 (de) | 1997-07-09 |
EP0782740B1 EP0782740B1 (de) | 1998-04-15 |
Family
ID=6528164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95929871A Expired - Lifetime EP0782740B1 (de) | 1994-09-14 | 1995-08-16 | Überwachungsvorrichtung für rechner mit angeschlossenen geräten wie monitor, drucker oder dergleichen |
Country Status (5)
Country | Link |
---|---|
US (1) | US5821868A (de) |
EP (1) | EP0782740B1 (de) |
AU (1) | AU3345895A (de) |
DE (2) | DE4432676A1 (de) |
WO (1) | WO1996008800A1 (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6111505A (en) * | 1996-07-03 | 2000-08-29 | Fred N. Gratzon | Security system |
GB2316212A (en) * | 1996-08-05 | 1998-02-18 | Dashcrown Limited | Security device for computer hardware |
KR100256944B1 (ko) * | 1997-07-31 | 2000-05-15 | 윤종용 | 피씨아이 핫 플러그를 위한 경보 장치 |
WO1999053627A1 (en) | 1998-04-10 | 1999-10-21 | Chrimar Systems, Inc. Doing Business As Cms Technologies | System for communicating with electronic equipment on a network |
GB9811641D0 (en) * | 1998-05-29 | 1998-07-29 | 3Com Technologies Ltd | Network security |
US6150925A (en) * | 1998-06-03 | 2000-11-21 | Intel Corporation | Connecting devices to in-car personal computers |
US6172606B1 (en) * | 1998-07-10 | 2001-01-09 | 3Com Technologies | Network security |
FI110388B (fi) * | 1998-11-11 | 2003-01-15 | Nokia Corp | Menetelmä ja järjestely näyttölaitteen käytön rajoittamiseksi |
US6147603A (en) * | 1999-11-12 | 2000-11-14 | Protex International Corp. | Anti-theft computer security system |
US6459374B1 (en) | 1999-11-12 | 2002-10-01 | Protex International Corp. | Anti-theft computer security system |
NL2000650C2 (nl) * | 2007-05-16 | 2008-11-18 | Briljant Octrooi B V | Diefstalbeveiligingssysteem voor toepassing aan een draagbare elektrische installatie. |
DE102011003071A1 (de) * | 2011-01-24 | 2012-07-26 | Lapp Engineering & Co. | Kabeldurchführung |
US10424882B2 (en) * | 2013-05-09 | 2019-09-24 | Invue Security Products Inc. | Security connector |
GB2547386B (en) * | 2014-10-31 | 2019-12-11 | Invue Security Products Inc | Security connector |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4123971A1 (de) | 1991-07-19 | 1993-01-21 | Tarik Ezzat | Alarmanlage |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3423747A (en) * | 1965-08-03 | 1969-01-21 | Harold C Hogencamp | Theft prevention device |
US4237450A (en) * | 1978-11-13 | 1980-12-02 | Canez Antonio R | Appliance theft alarm |
US4327360A (en) * | 1980-06-10 | 1982-04-27 | Brown E B | Alarm device responsive to movement of protected object, power source condition and alarm ground path |
FR2593950A1 (fr) * | 1986-02-04 | 1987-08-07 | Gerard Weisz | Systeme antivol pour micro-ordinateur |
US5034723A (en) * | 1990-03-01 | 1991-07-23 | Nynex Corporation | Security cable and system for protecting electronic equipment |
US5003292A (en) * | 1990-05-30 | 1991-03-26 | James E. Grimes Co., Inc. | Fiber optic security system for protecting equipment from tampering |
US5059948A (en) * | 1990-07-26 | 1991-10-22 | Tronics 2000, Inc. | Anti-theft security device and alarm |
US5159316A (en) * | 1990-08-03 | 1992-10-27 | Lazzara Electronics, Inc. | Capacitance change article removal alarm |
US5142269A (en) * | 1991-04-01 | 1992-08-25 | Charles T. Rush | Electronic component theft sensor and security system |
US5231375A (en) * | 1991-06-07 | 1993-07-27 | Rolm Company | Apparatus and method for detecting theft of electronic equipment |
DE9110174U1 (de) * | 1991-08-16 | 1991-10-24 | Zellner Rechnerkomponenten GmbH, 8000 München | Diebstahlsicherungsvorrichtung |
DE9311034U1 (de) * | 1993-07-23 | 1993-09-30 | ESE Elektronische Sicherungsanlagen Entwicklungsgesellschaft mbH, 41469 Neuss | Diebstahlsicherung für Computer |
US5675321A (en) * | 1995-11-29 | 1997-10-07 | Mcbride; Randall C. | Personal computer security system |
-
1994
- 1994-09-14 DE DE4432676A patent/DE4432676A1/de not_active Withdrawn
-
1995
- 1995-08-16 US US08/809,273 patent/US5821868A/en not_active Expired - Fee Related
- 1995-08-16 DE DE59501933T patent/DE59501933D1/de not_active Expired - Fee Related
- 1995-08-16 EP EP95929871A patent/EP0782740B1/de not_active Expired - Lifetime
- 1995-08-16 AU AU33458/95A patent/AU3345895A/en not_active Abandoned
- 1995-08-16 WO PCT/EP1995/003225 patent/WO1996008800A1/de active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4123971A1 (de) | 1991-07-19 | 1993-01-21 | Tarik Ezzat | Alarmanlage |
Non-Patent Citations (1)
Title |
---|
See also references of WO9608800A1 |
Also Published As
Publication number | Publication date |
---|---|
WO1996008800A1 (de) | 1996-03-21 |
US5821868A (en) | 1998-10-13 |
DE59501933D1 (de) | 1998-05-20 |
DE4432676A1 (de) | 1996-03-21 |
EP0782740B1 (de) | 1998-04-15 |
AU3345895A (en) | 1996-03-29 |
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