Multiplex communications – Diagnostic testing – Determination of communication parameters
Reexamination Certificate
1998-06-24
2001-02-20
Vincent, David R. (Department: 2732)
Multiplex communications
Diagnostic testing
Determination of communication parameters
C370S462000
Reexamination Certificate
active
06192036
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method of operating a data transmission system.
BACKGROUND INFORMATION
German Patent Application No. 42 13 792 describes a method for operating a data transmission system where data is transmitted to several other stations using a call message, referred to as Call Offering Procedure (COP), sent by a station having the bus access right. The other stations, which have been requested by the COP to transmit a response message, send their response messages in a predefined sequence in time slots of fixed length over the bus line. The options for defining this sequence include hardware coding by the user at startup, parameterization in the initializing phase, or a definition as a function of the station addresses. Direct mapping of station addresses to time slot numbers should be mentioned as a variant that can be implemented inexpensively, where the time slot starting with time t
1
is assigned to the station having address
1
, time slot at t
2
to address
2
, etc. The known method improves the transmission rate, but does not represent an optimum solution.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method for operating a data transmission system where the transmission rate is further increased.
An advantage of the present invention is that the sequence of the stations that are to respond is time optimized. For example, it cannot occur that a station with a very short response time has to wait for the transmission of its data, due to its high station address, until slow stations have responded and transmitted their data. Since the actual transmission times are often short compared to the internal processing time of a polling message by the polled station, the time required for processing a polling message to a plurality of other stations is determined according to the present invention by the response time of the slowest station. The occurrence of no response message, one response message or several response messages received consecutively or in overlapping time periods can be handled by the calling station. A method is provided with which a station in a bus system can collect data simultaneously from one or more stations, can distribute data simultaneously to one or more stations, a station can distribute data to one or more stations and collect data from these stations simultaneously, a station can determine the presence of other stations, and a station can poll other stations for certain features. In addition, other applications of the method are conceivable and possible. The expression “more stations” refers to a group of at least two and a maximum of all the stations connected.
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Bühler Reiner
Döbrich Udo
Kenyon & Kenyon
Siemens AG
Vincent David R.
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