Automatic can address allocation method

US6216172A · kind A · utility

Assignee

• Endress+Hauser Inc. · DE

Inventors

• Robert Kolblin · Lörrach, DE
• Wolfgang Eiche · Neuenweg, DE

Key dates

• Filing date: Mar 26, 1998
• Grant date: Apr 10, 2001
• Expiry date: Mar 26, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L61/5092
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

For automatic CAN address allocation each bus subscriber still to be allocated an address, generates a random value for a provisional address on system power up. On receiving a request to commence address allocation each bus subscriber writes a telegram claiming the provisional address into the CAN send buffer. If a bus subscriber receives a telegram claiming an address which agrees with its own provisional address, a new random value is generated for a provisional address and a telegram claiming this provisional address is written into the CAN send buffer. If the telegram claiming the provisional address is sent before a telegram claiming the same provisional address is received, the provisional address is deposited in the writeable non-volatile memory as the final address.