Patent ID: 6480101
Filing Date: 2002-11-12
Classification: G06K

Abstract:
A method for exchanging data in a contactless proximity automated data collection system between a tag and a host computer, the method comprising the steps of:transmitting an imawake message from the tag to the host computer; transmitting a first host message from the host computer to the tag in response to the imawake message, the first host message comprising one of a readpage message and a writepage message; determining whether the first host message is valid at the tag; transmitting a second tag message from the tag to the host computer if the first host message is valid, the second tag message comprising one of a sendingpage message if the first host message is a readpage message and an acknowledge message if the first host message is a writepage message; and transmitting a non-acknowledge message from the tag to the host computer if the first host message is invalid.