Method for centrally setting data rate in a data transmission facility and a device for centrally setting data rates

• US 6,944,693 B2
• Filed: 03/28/2002
• Issued: 09/13/2005
• Est. Priority Date: 05/05/2001
• Status: Expired due to Fees

• Current Assignee: Phoenix Contact GmbH & Company KG
• Original Assignee: Phoenix Contact GmbH & Company KG
• Inventors: Schönherr, Dietmar
• Primary Examiner(s): Auve, Glenn A.
• Assistant Examiner(s): Lee, Christopher E.
• Application Number:
  US10/113,440
• Publication Number:
  US 20020194360A1
• Time in Patent Office: 1,265 Days
• Field of Search: 710/305, 710/104, 710/110, 710/8, 710/15, 700/83, 709/225, 713/600, 340/310.02, 375/377, 375/370, 375/357, 375/350, 375/225, 375/224, 375/222
• US Class Current: 710/106
• CPC Class Codes: H04L 25/0262 Arrangements for detecting the data rate of an incoming signal
• CPC Class Codes: H04L 5/1446 of transmission speed

Abstract

In the method according to the present invention for centrally setting data rate in a data transmission facility, the data rate is detected and set at subscribers on the basis of data rate setting telegrams sent by a central station. In addition to an interface to a peripheral application, the subscribers include a protocol core and devices according to the present invention for data rate detection and setting. Data rate detection is solved with a telegram detection system, wherein one data rate detector is provided for each data rate and the transmitted telegrams in the timed data rate setting phase have the same content for each of the data rates concerned.

Claims

1. A system for centrally setting a data rate in a data transmission facility, comprising:

a) a central station; and

b) subscribers;

wherein said central station is disposed in series with said subscribers by a bus circuit;

wherein said subscribers are disposed in series with each other by bus circuits;

wherein each subscriber has a protocol core;

wherein each subscriber has data rate detectors;

wherein each subscriber has a data rate controller;

wherein said central station outputs data rate setting telegrams of a data rate to be set in said subscribers;

wherein a first subscriber inputs said data rate of said data rate setting telegrams outputted from said central station;

wherein each data rate detector of a respective subscriber detects a data rate different than that of the other data rate detectors thereof to allow only one data rate detector to detect only one valid data rate and in response thereto generate only one data rate validity signal; and

wherein said data rate detectors of said respective subscriber simultaneously receive and evaluate said data rate inputted until such time as said one valid data rate has been detected by said one data rate detector thereof forming a detected data rate and in response thereto said one data rate detector thereof sends said one data rate validating signal thereof to said data rate controller thereof and in response thereto said data rate controller thereof selects said one data rate detector thereof having said detected data rate to form a bypass-type connection through said respective subscriber to output said detected data rate from said respective subscriber to be inputted by a next subscriber in series therewith to be used thereby to start data rate setting therein and so on until all of said subscribers in series with each other have data rates set therein.

2. The system as defined in claim 1, wherein each subscriber has a data output;

wherein each subscriber has a data input;

wherein each subscriber has a data circuit input-output selection switch;

wherein each subscriber has an internal data circuit;

wherein each subscriber has a data circuit output change-over switch;

wherein said data input of said respective subscriber inputs said data rate setting;

wherein said internal data circuit of said respective subscriber activates said data circuit output change-over switch thereof to form said bypass-type connection through said respective subscriber; and

wherein said data output of said respective subscriber outputs said detected data rate from said respective subscriber to be inputted by said data input of said next subscriber in series therewith.

3. The system as defined in claim 2, wherein each subscriber has a reset signal;

wherein each subscriber has an application interface; and

wherein said data rate controller activates said reset signal to said protocol core until said valid data rate has been detected and data rate detection has been transferred to said protocol core and in response thereto said data rate output change-over switch is switched to a protocol core data output and in response thereto said protocol core begins a protocol evaluation and transmits said valid data rate to an external application by way of said application interface establishing a link between said external application and said protocol core.

4. The system as defined in claim 2, wherein one of said subscribers has said data rate firmly fixed by preselection of said data rate detector to allow in a data rate setting phase only said data rate setting telegrams having a firmly set data rate to be forwarded via said data output to said next subscriber.

5. The system as defined in claim 1, wherein said data rate controller in order to set a stable data rate does not fix said data rate until one of a specified number of said data rate setting telegrams have been detected and a specified time period has elapsed.

6. The system as defined in claim 1, wherein said data rate is set in said protocol core when an expected significant bit pattern is detected from a plurality of possible data rates.

7. The system as defined in claim 1, wherein said protocol core is deactivated in a data rate setting phase.

8. The system as defined in claim 1, 2, 5, 3, 6, 7, or 4, wherein said data rate setting telegrams have respectively a same content for each data rate.

9. The system as defined in claim 8, wherein a small number of bits having a known state are used in order to detect said data rate from said data rate setting telegrams.

10. The system as defined in claim 9, wherein a bit sequence of said data rate setting telegrams is used for another function in the data transmission facility.

11. The system as defined in claim 9, wherein said data rate is firmly set at one subscriber and said central station and all other subscribers are set to this data rate.

12. The system as defined in claim 8, wherein a bit sequence of said data rate setting telegrams is used for another function in the data transmission facility.

13. The system as defined in claim 12, wherein said data rate is firmly set at one subscriber and said central station and all other subscribers are set to this data rate.

14. The system as defined in claim 8, wherein said data rate is firmly set at one subscriber and said central station and all other subscribers are set to this data rate.

15. A method for centrally setting a data rate in a data transmission facility, comprising the steps of:

a) providing a central station and subscribers;

b) disposing the central station in series with the subscribers by a bus circuit;

c) disposing the subscribers in series with each other by bus circuits;

d) providing each subscriber with a protocol core, data rate detectors, and a data rate controller;

e) outputting by the central station data rate setting telegrams of a data rate to be set in the subscribers;

f) inputting by a first subscriber the data rate of the data rate setting telegrams outputted from the central station;

g) detecting by each data rate detector of a respective subscriber a data rate different than that of the other data rate detectors thereof to allow only one data rate detector to detect only one valid data rate and in response thereto generate only one data rate validity signal; and

h) receiving and evaluating by the data rate detectors of the respective subscriber simultaneously the data rate inputted until such time as the one valid data rate has been detected by the one data rate detector thereof forming a detected data rate and in response thereto the one data rate detector thereof sends the one data rate validating signal thereof to the data rate controller thereof and in response thereto the data rate controller thereof selects the one data rate detector thereof having the detected data rate to form a bypass-type connection through the respective subscriber to output the detected data rate from the respective subscriber to be inputted by a next subscriber in series therewith to be used thereby to start data rate setting therein and so on until all of the subscribers in series with each other have data rates set therein.

16. The method as defined in claim 15;

further comprising the step of providing each subscriber with a data output, a data input, a data circuit input-output selection switch, an internal data circuit, and a data circuit output change-over switch;

wherein said receiving and evaluating step includes;

a) inputting by the data input of the respective subscriber the data rate setting;

b) activating by the internal data circuit of the respective subscriber the data circuit output change-over switch thereof to form the bypass-type connection through the respective subscriber; and

c) outputting by the data output of the respective subscriber the detected data rate from the respective subscriber to be inputted by the data input of the next subscriber in series therewith.

17. The method as defined in claim 16;

further comprising the step of providing each subscriber with a reset signal and an application interface;

wherein said receiving and evaluating step includes activating by the data rate controller the reset signal to the protocol core until the valid data rate has been detected and data rate detection has been transferred to the protocol core and in response thereto the data rate output change-over switch is switched to a protocol core data output and in response thereto the protocol core begins a protocol evaluation and transmits the valid data rate to an external application by way of the application interface establishing a link between the external application and the protocol core.

18. The method as defined in claim 16, wherein said receiving and evaluating step includes firmly fixing the data rate of one of the subscribers by preselection of the data rate detector to allow in a data rate setting phase only the data rate setting telegrams having a firmly set data rate to be forwarded via the data output to the next subscriber.

19. The method as defined in claim 15, herein said receiving and evaluating step includes not fixing by the data rate controller the data rate until one of a specified number of the data rate setting telegrams have been detected and a specified time period has elapsed in order to set a stable data rate.

20. The method as defined in claim 15, wherein said receiving and evaluating step includes setting the data rate in the protocol core when an expected significant bit pattern is detected from a plurality of possible data rates.

21. The method as defined in claim 15, wherein said receiving and evaluating step includes deactivating the protocol core in a data rate setting phase.

22. The method as defined in claim 15, 16, 19, 17, 20, 21, or 18, wherein said outputting step includes providing the data rate setting telegrams with respectively a same content for each data rate.

23. The method as defined in claim 22, wherein said receiving and evaluating step includes using a small number of bits having a known state in order to detect the data rate from the data rate setting telegrams.

24. The method as defined in claim 23, wherein said receiving and evaluating step includes using a bit sequence of the data rate setting telegrams for another function in the data transmission facility.

25. The method as defined in claim 23, wherein said receiving and evaluating step includes firmly setting the data rate at one subscriber and the central station and all other subscribers are set to this data rate.

26. The method as defined in claim 22, wherein said receiving and evaluating step includes using a bit sequence of the data rate setting telegrams for another function in the data transmission facility.

27. The method as defined in claim 26, wherein said receiving and evaluating step includes firmly setting the data rate at one subscriber and the central station and all other subscribers are set to this data rate.

28. The method as defined in claim 22, wherein said receiving and evaluating step includes firmly setting the data rate at one subscriber and the central station and all other subscribers are set to this data rate.