SYSTEM AND METHOD FOR OPERATING A BUS SYSTEM

• US 20100174843A1
• Filed: 03/17/2010
• Published: 07/08/2010
• Est. Priority Date: 03/02/2005
• Status: Active Grant

• Current Assignee: Rohde & Schwarz GmbH & Company KG
• Original Assignee: Rohde & Schwarz GmbH & Company KG
• Inventors: HUBER, Martin, Koehler, Hendrik
• Granted Patent: US 8,335,241 B2
• Time in Patent Office: Days
• US Class Current: 710/308
• CPC Class Codes: G05B 2219/15072 Modules in daisy chain, connected by parallel cable
• CPC Class Codes: H03M 5/12 Biphase level code, e.g. split phase code, Manchester code; Biphase space or mark code, e.g. double frequency code
• CPC Class Codes: H04L 12/403 with centralised control, e.g. polling
• CPC Class Codes: H04L 12/4135 using bit-wise arbitration
• CPC Class Codes: H04L 2012/6435 Bus
• CPC Class Codes: H04L 25/4904 using self-synchronising codes, e.g. split-phase codes
• CPC Class Codes: H04L 47/30 in combination with information about buffer occupancy at either end or at transit nodes

Abstract

A bus system for the real-time communication of a superordinate unit with one or more subordinate units is used for exchanging address and data information via a bus. For the rapid exchange of messages, further fields are provided between the fields for the address and data information.

Claims

1. A method for operating a bus system for the real-time communication of a superordinate unit with one or more subordinate units for the exchange of address information and data information and for the exchange of additional messages comprising the following procedural stages:

checking whether an internal memory of a subordinate unit contains a message, whenever this subordinate unit receives a message from another subordinate unit;

entering the received message in the memory, if the memory already contains a message, and communicating the message only if all messages previously-received or entered in the memory have been communicated to the subordinate unit and

communicating a message directly, whenever the message is received from a subordinate unit and the memory is empty.

2. A method according to claim 1,

wherein characterized

the status of the memory is not checked if a time-critical message is received from a subordinate unit, but an internal status is verified directly, and that the message is then communicated, if the status is READY.

3. A method according to claim 2,

wherein characterized

the quantity of all time-critical messages comprises at least three messages, namely a TX_ACTIVE message, which introduces a transmission mode, a TX_ACTIVE/CARRIER_MAGNITUDE message, which marks the transmission mode, and a READY message, which marks a ready status.

4. A method according to claim 3

wherein characterized

the TX_ACTIVE message and the TX_ACTIVE/CARRIER_MAGNITUDE message are transmitted from the superordinate unit, which is a radio device, to the subordinate units, which are supplementary devices to the radio device, and that the READY message is communicated from one subordinate unit to a subsequent subordinate unit, until a final subordinate unit connected directly to the superordinate unit transmits this message to the superordinate unit.

5. A method according to claim 4,

wherein characterized

all current adjustment procedures are concluded if a supplementary device receives a TX_ACTIVE or TX_ACTIVE/CARRIER_MAGNITUDE message from the radio device.

6. A method according to claim 5,

wherein characterized

an internal status of the supplementary device is set to READY after the conclusion of the adjustment processes, and that this is immediately communicated to the subsequent supplementary device or radio device after the reception of a READY message from another supplementary device.