Siemens Aktiengesellschaft

Rainer Mattes

Herbert Barthel

Wolfgang Schmauss

Heiner Fuchs

Edgar Sigwart

Alexander Pfister

Ingmar Binder

Georg Haller

Thomas Peter

Uwe Weber

The invention relates to a system and a method for transmitting telegrams. The system has at least one first communication means provided for sending telegrams and at least one second communication means provided for receiving telegrams, with a telegram having a check value that can be determined from a useful data component of the telegram, with the first communication means having a first telegram counter provided for assigning a count value to a telegram in accordance with a send sequence. To improve error detection during the transmission of telegrams it is proposed that the count value for determining the check value be a constituent of the useful data component is, that information signaling a change in the count value be a constituent of the useful data component when the telegram is transmitted, that the second communication means have a second telegram counter, and that means be provided for synchronizing the first and second telegram counter.

Method and system for transmitting telegrams

The invention relates to a method and a system for detecting errors in the communication of data from a transmitter to at least one receiver. In the method, in a first step on the side of the transmitter a first check value is generated at least from user data to be communicated; in a second step on the side of the transmitter a second check value is generated at least from the user data and the first check value; in a third step at least the user data, the first check value and the second check value are communicated to the receiver; in a fourth step on the side of the receiver the communicated user data and the communicated first check value are verified with the aid of the second check value; and in a fifth step on the side of the receiver the communicated user data are verified with the aid of the first check value. To improve the detection of errors in the communication of data from the transmitter to the at least one receiver it is proposed that, in the first step, the user data are modified to generate the first check value, in the second step the unmodified user data are used to generate the second check value, in the fourth step the unmodified communicated user data are used, and in the fifth step the communicated user data are modified according to the modification in the first step for checking with the aid of the first check value.

Detection of errors in the communication of data

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Munich, Georgia

Rainer Mattes