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

• US 20020194360A1
• Filed: 03/28/2002
• Published: 12/19/2002
• Est. Priority Date: 05/05/2001
• Status: Active Grant

• Current Assignee: Phoenix Contact GmbH & Company KG
• Original Assignee: Phoenix Contact GmbH & Company KG
• Inventors: Schonherr, Dietmar
• Granted Patent: US 6,944,693 B2
• Time in Patent Office: Days
• US Class Current: 709/233
• 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 invention for centrally setting data rate in a data transmission facility, the data rate is detected and set at the subscribers on the basis of the data rate setting telegrams sent by the central station. In addition to the interface to the peripheral application, the subscribers include a protocol core and the devices according to the invention for data rate detection and setting. Date 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 method for centrally setting data rate in a data transmission facility with a central station (1) and at least one subscriber (3, 4, 5) connected to the field bus, which central station includes a protocol core (31) and one or more devices for setting data rate (32, 33, 34, 35),

characterized in that

the devices for setting data rate receive and evaluate data rate setting telegrams (53), and when the data rate of the received data rate setting telegram (53) is detected from a plurality of possible data rates, the data rate is set in protocol core (31).

2. The method according to claim 1,

characterized in that

data rate setting occurs in a time period reserved for that purpose.

3. The method according to claims 1 and 2,

characterized in that

protocol core (31) is deactivated in data rate setting phase (42).

4. The method according to any of claims 1 to 3,

characterized in that

in data rate setting phase (42), logic switches (36, 37) inside the subscriber (3, 4, 5) switch internal data circuit (28) so that protocol core (31) is bridged in the manner of a bypass.

5. The method according to any of claims 1 to 4,

characterized in that

in data rate setting phase (42), the data rate setting telegrams (53) received at data input (22) in a subscriber (2) are transferred at the data output to the data input (22) of the subsequently configured subscriber (3) in each case.

6. The method according to any of claims 1 to 5,

characterized in that

the data rate setting telegrams (53) have respectively the same content for each data rate.

7. The method according to any of claims 1 to 6,

characterized in that

a small number of bits having known state are used in order to detect the data rate from data rate setting telegrams (53).

8. The method according to any of claims 1 to 7,

characterized in that

the bit sequence of the data rate setting telegrams is used for another function in the data transmission facility.

9. The method according to any of claims 1 to 8,

characterized in that

the data rate may be firmly set at one subscriber (2, 3, 4) and central station (1) and all other subscribers are set to this data rate.

10. A device for centrally setting data rate in a data transmission facility with a central station (1) and at least one subscriber (3, 4, 5) connected to the field bus, which central station includes a protocol core (31) and one or more devices for setting data rate (32, 33, 34, 35), setting data rate,

characterized in that

one data rate detector (32, 33, 34) is provided for each data rate in every subscriber (3, 4, 5), each detector receiving and evaluating the data rate setting telegrams (53) simultaneously, and when an expected significant bit pattern is detected from a plurality of possible data rates, the data rate is set in protocol core (31).

11. The device according to claim 10,

characterized in that

protocol core (31) is deactivated in data rate setting phase (42).

12. The device according to claim 10 or 11,

characterized in that

in data rate setting phase (42), internal logic switches (36, 37) transfer received data rate setting telegrams (53) to output (23).

13. The device according to any of claims 10 to 12,

characterized in that

in data rate setting phase (42), internal logic switches (36, 37) transfer received data rate setting telegrams (53) to output (23).

14. The device according to any of claims 10 to 13,

characterized in that

data rate setting telegrams (53) are used for an additional function in the data transmission facility.

15. The device according to any of claims 10 to 14,

characterized in that

in one of subscribers (2, 3, 4) the data rate is firmly fixed by preselection of the data rate detector (32, 33, 34), so that in the data rate setting phase (42) only data rate setting telegrams having the firmly set data rate are forwarded via output (23) to the next subscriber (3, 4).