Patent ID: 6680918
Filing Date: 2004-01-20
Classification: B61L,H04L,H04W

Abstract:
A method of communicating between a master unit and one or more slave units in a network, the method comprising:transmitting, from the master unit to a slave unit, queries using a first network ID of a first group of network ID's; transmitting, from the slave unit to the master unit, a response using the first network ID if the slave unit is listening for the first network ID; transmitting, from the master unit to an addressed slave unit, a query, which includes identification of the first network ID in a data portion of the query, using a second network ID of a second group of network ID's if the master unit does not receive the response to the queries using the first network ID from the slave unit in a first time period; and transmitting, from the addressed slave unit to the master unit, a response to the query which included the first network ID in the data portion of the query using the second network ID and then changing to listening for and transmitting using the first network ID.