EP0505831B1 - Verfahren zur Datensicherung bei einer Datenübertragung in eiem Taxameter - Google Patents

Verfahren zur Datensicherung bei einer Datenübertragung in eiem Taxameter Download PDF

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Publication number
EP0505831B1
EP0505831B1 EP92104133A EP92104133A EP0505831B1 EP 0505831 B1 EP0505831 B1 EP 0505831B1 EP 92104133 A EP92104133 A EP 92104133A EP 92104133 A EP92104133 A EP 92104133A EP 0505831 B1 EP0505831 B1 EP 0505831B1
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EP
European Patent Office
Prior art keywords
signature
taximeter
data
test
display
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.)
Expired - Lifetime
Application number
EP92104133A
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German (de)
English (en)
French (fr)
Other versions
EP0505831A3 (en
EP0505831A2 (de
Inventor
Jürgen Dipl.-Ing. Adams (FH)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mannesmann VDO AG
Original Assignee
Mannesmann VDO AG
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Publication date
Application filed by Mannesmann VDO AG filed Critical Mannesmann VDO AG
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Publication of EP0505831A3 publication Critical patent/EP0505831A3/de
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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B13/00—Taximeters

Definitions

  • the invention relates to a method for data backup during data transmission, in particular tariff parameters in a taximeter or odometer using a signature calculation and a display.
  • the formation of the security code (residues) and the check after reception is generally carried out by feedback shift registers, the feedback points generally by the polynomial -Description of the database or the generator polynomial are determined.
  • the correlations are explained in an essay entitled “Data backup on transmission paths with cyclic codes” by Reiner Münchrath, published in the magazine ELEKTRONIK, year 1976, issue 8 on pages 55 to 59.
  • the document EP-A-0 157 258 also describes a type of data backup on transmission paths, with this Procedure from an entire (digitally to be transmitted) document with an RSA-like procedure, test information is formed in the transmitter and receiver and checked for equality.
  • Data stocks on rotating media are also typically secured with cyclic codes.
  • the codes are designed in such a way that typical errors can be identified and corrected under foreseeable circumstances.
  • Data backups for internal processes are often based on parity checks and are mainly restricted to small amounts of data.
  • the task is reduced to Detection and output of an error message or temporary reduction in the scope of the data processing program.
  • An advantage of a check using the method of a parity check is the uncomplicated and rapid formation of the backup data (parity bits or parity words);
  • One disadvantage is the "weakness" of the fuse, since there are basically several data bit combinations for a parity word or in the case of single-bit checking, parity bits.
  • a known test device is designed so that signals are recorded in the circuit under test by means of a test pin and clocked into a feedback shift register in the test device. The clock must be generated synchronously by the digital circuit to be tested. As a result, a 4-digit hexadecimal number appears on the display of the test device. A corresponding hexadecimal number is given for the individual test points in a circuit in an associated circuit diagram, so that a service technician can interpret a correct signal sequence without time-consuming testing and assessment using an oscilloscope.
  • FIG. 2 shows a front view of a taximeter or odometer with a display 30 and four operating elements 31 in the form of keys T1 to T4, by means of which switches S1 to S4, not shown in greater detail, are actuated on a circuit board.
  • the display 30 is also attached to the printed circuit board and can be read through a front glass plate 32 in a front housing shell 33.
  • the display 30 is divided into a plurality of controllable display elements and is divided into a main display 34, a secondary display 35, a tax level display 36, a time calculation symbol 37, an error word display symbol 38 and six flags 41 to 46.
  • the main display 34 is made up from a six-digit number and is used when using a display of the fare, the route, the control counter values, the parameters and the error display.
  • the secondary display 35 is a four-digit number by which in the application a surcharge, a tip amount, a fixed value (e.g. distance traveled), a maintenance index (for service), a function display of the maintenance programs or a pulse count in test mode is displayed will.
  • the tax level display 36 shows the tariff level selected in terms of numbers.
  • the time allocation symbol 37 designed as a clock symbol, indicates the status of a time allocation within a tax level.
  • Flags 41 to 46 are freely parameterizable characters to support the display of special functions of the individual tax levels.
  • Flag 41 is generally used to mark the tax level setting, flag 42 to indicate a "checkout” position in a tax level, and finally flag 43 points as an arrow pointing to the functional position "free” printed on a panel 39.
  • the flag 44 can mark, for example, a display of the control counter.
  • the set flag 45 indicates that a parameterization has been enabled, which takes place in connection with the setting of a switch 40 to so-called enable contacts 47 (for "0") and 48 (for "1").
  • an eight-pin test socket 49 is provided, which is used for data input / output via serial interface. Access to the release contacts 47, 48 and to the test socket 49 is covered by a cover cap 50 and secured by a seal 51.
  • the maintenance program is called and thus the possibility of enabling data input is protected by a seal 51.
  • the seal 51 Before the maintenance program is called for a parameter input via keys or via SCOM, the seal 51 must therefore be broken, whereby other functions, such as deletion functions, and a number of other test functions are also open for use.
  • the test switch 40 By removing the seal 51 and the cover cap 50, the test switch 40, which is now accessible, can be actuated and it is possible to influence the previous data stock by key input and via serial communication (SCOM).
  • SCOM serial communication
  • a signature R (x) the database of a complete parameter set in the taximeter, consisting of control data for determining the course of fare calculations (control functions for operation, Symbol display, assignments of data to control counters, etc.) and data for fare determination after a program has been manually called up, subjected to a polynomial division.
  • the division runs in several steps, such that z. B. starting with the most significant data in the power of the generator polynomial G (x) a bit-wise modulo-2 addition is carried out (cf. chapter 3.4.2 from the literature mentioned "Coding for error correction and error detection").
  • the calculation also includes storage locations that cannot be changed by entering the parameters. These storage locations are loaded with defined values in the course of the manufacturing process. In this way it can be achieved that. B. assignment features not visible to the outside can be incorporated, which lead to different signatures with otherwise the same parameterization of the device. Such assignment features are suitable for. B. to separate business areas of different service stations or business areas of different authorized representatives. Or it can be ensured that only memory modules, in particular EEPROMs, are used for repair, for example, that have been "authorized" by a service point.
  • the data is entered in a test taximeter and then checked for correct function.
  • a signature R (x) of the checked parameter set is generated and made available for transfer to the responsible calibration office.
  • a program is started by means of control buttons in the test taximeter, which calculates a signature R (x) according to the method described above and the latter as a z. B. four-digit, hexa-decimal number.
  • the signature R (x) is then sent to the relevant verification office in a sealed message or by telephone.
  • Fig. 1 the operation of a taximeter with program selection, parameter loading and generation of the signature R (x) is shown in a flow chart.
  • the program starts in step 1 after applying an operating voltage or a voltage dip (corresponds to a cold start).
  • stage 2 of the flow chart there is a branch to the two programs “program management maintenance” 4 or “taximeter program in normal operation” 3 as a function of a control bit.
  • the influencing of the control bit is not shown in more detail and takes place in program levels 3 and 4, the "program management maintenance” 4 in level 3 being called under the condition of the device switch position FREE and a switch back from level 4 to level 4 taking place.
  • the program management maintenance according to item 4 is used to select the programs from a list or to release the corresponding indexed program.
  • the switching stages according to items 5, 8 and 11 are used to selectively assign a corresponding maintenance program depending on a selected index a, b, c and a release in switching stage 4, the release by means of control buttons T1 to T4 which can be predetermined for this in switching stage 4 he follows.
  • the maintenance program is called up and operated in stage 4 and assigned with items 5 and 8, respectively. If the sealable switch 40 is not closed, i. H. If authorization has not been given, the operation of the corresponding maintenance program 5 or 8 is suppressed.
  • Steps 7 and 10 contain maintenance programs for recording and displaying parameters for operating the taximeter, in particular parameters for calculating the fare from travel and time components, as well as other control parameters which influence the operation of the taximeter in normal operation according to function level 3.
  • Level 7 is used to record the parameters by key input, while level 10 controls the recording of the parameters by input via SCOM (Serial Communication).
  • step 12 contains the maintenance program for generating the signature R (x) and for displaying the found value R (x) in the main display 34 of the Taximeter device.
  • function step 13 the index of the maintenance program to be activated selected in stage 4 is displayed as long as the selected program has not been released in stage 4. With the release in stage 4 and call of the maintenance program, the display of program-specific displays is overwritten. When deactivated, function level 13 becomes active again and shows the current maintenance index.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Devices For Checking Fares Or Tickets At Control Points (AREA)
  • Traffic Control Systems (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
EP92104133A 1991-03-23 1992-03-11 Verfahren zur Datensicherung bei einer Datenübertragung in eiem Taxameter Expired - Lifetime EP0505831B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4109682A DE4109682C1 (enrdf_load_stackoverflow) 1991-03-23 1991-03-23
DE4109682 1991-03-23

Publications (3)

Publication Number Publication Date
EP0505831A2 EP0505831A2 (de) 1992-09-30
EP0505831A3 EP0505831A3 (en) 1993-08-04
EP0505831B1 true EP0505831B1 (de) 1997-05-21

Family

ID=6428107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92104133A Expired - Lifetime EP0505831B1 (de) 1991-03-23 1992-03-11 Verfahren zur Datensicherung bei einer Datenübertragung in eiem Taxameter

Country Status (6)

Country Link
EP (1) EP0505831B1 (enrdf_load_stackoverflow)
JP (1) JPH05130097A (enrdf_load_stackoverflow)
AT (1) ATE153461T1 (enrdf_load_stackoverflow)
DE (2) DE4109682C1 (enrdf_load_stackoverflow)
ES (1) ES2103011T3 (enrdf_load_stackoverflow)
IL (1) IL101263A (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9306016U1 (de) * 1993-04-21 1993-12-16 Mannesmann Kienzle Gmbh, 78052 Villingen-Schwenningen Taxameter
DE4445670A1 (de) * 1994-12-21 1996-06-27 Vdo Schindling Verfahren zur Identifikation des Benutzers eines Taxameters
DE29518000U1 (de) * 1995-11-14 1996-02-15 VDO Adolf Schindling AG, 65824 Schwalbach Elektronischer Fahrtschreiber

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1519721A (en) * 1977-05-13 1978-08-02 Green W E Taximeters
GB1586557A (en) * 1977-06-13 1981-03-18 Western Eng Ltd Electronic taximeter
DE3204081A1 (de) * 1982-02-06 1983-08-18 Kienzle Apparate Gmbh, 7730 Villingen-Schwenningen Verfahren zur verbesserung der eichamtlichen abnahme von elektronischen taxametern
US4625076A (en) * 1984-03-19 1986-11-25 Nippon Telegraph & Telephone Public Corporation Signed document transmission system
FR2619234B1 (fr) * 1987-08-07 1991-04-19 Ricard Claude Procedes et dispositifs adaptateurs pour introduire des donnees dans des taximetres electroniques a partir d'un ordinateur central relie temporairement a un terminal local

Also Published As

Publication number Publication date
DE4109682C1 (enrdf_load_stackoverflow) 1992-08-27
ES2103011T3 (es) 1997-08-16
EP0505831A3 (en) 1993-08-04
EP0505831A2 (de) 1992-09-30
ATE153461T1 (de) 1997-06-15
DE59208509D1 (de) 1997-06-26
JPH05130097A (ja) 1993-05-25
IL101263A (en) 1995-03-15
IL101263A0 (en) 1992-11-15

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