US 5,675,571 AGranted

D2B divice address initialization by use of default address

AssigneeD2B Systems Company Limited

InventorNeil A. Wilson

Life of this patent

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Abstract

In a single channel communication bus system, e.g. D.sub.2 B, sometimes two devices of the same type must be initialized at the same time. These devices start out with the same address installed by the manufacturer. The installed address includes follower bits which can be changed to account for the presence of other devices. During initialization, all devices are set to a dummy address and the installed address is stored. Each station then looks for devices having its own installed address. If, after 3 tries, none is found then the stored address is used. If other devices having the installed address are found, the follower bits can be changed. The station iterates until all possible follower bits are exhausted. In this way the stations of the same type have an improved likelihood of being initialized with distinct addresses.

Claims25

Dependent claims

A single channel communication bus system comprising a communication bus having a plurality of stations connected thereto, which stations can communicate with one another via the communication bus, to each of which stations a unique station address is to be assigned, each of said respective stations comprising a respective interface circuit for

calling any destination station by generating a destination station address for that destination stations,
receiving an acknowledge signal that is transmitted by that destination station, if the station address of that destination station corresponds to the transmitted destination station address, interface circuit of a station is further adapted to
performing an initialization program under the control of which the interface circuit generates and transmits the destination station address more than one time,
discontinuing generating and transmitting upon absence of the acknowledge signal, and the destination station address which has been generated and transmitted being assigned as a master station address for the respective station,
characterized in that each station, before sending a destination station address during the initialization program, adopts a default address.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/382,058Filed 13 Mar 1995
Priority: EP 9320183825 Jun 1993
Granted: 7 Oct 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04L 61/5038
Address allocation: for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]
H04L 12/4135
With random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]: using bit-wise arbitration
H04L 61/5046
Address allocation: resolving address allocation conflicts; Testing of addresses
G06F 12/0669
Configuration or reconfiguration: with decentralised address assignment