Reader/writer and data communication method
First Claim
1. A reader and writer configured to transmit and receive data, by wireless communications, to and from a wireless tag having a storage unit, said reader and writer comprising:
- a control unit configured;
to execute data transmission or data reception between said reader and writer and a wireless tag;
to transmit completion time information indicating completion time of said data transmission or said data reception to said wireless tag, said completion time information being stored in said storage unit; and
to transmit a tag selection command including time information that is used by said wireless tag to judge whether said wireless tag is selected or not by comparing said stored time information and said completion time information.
1 Assignment
0 Petitions
Accused Products
Abstract
A reader/writer transmitting and receiving data, through wireless communications, to and from a passive type wireless tag having a nonvolatile storage unit, includes a tag selection unit selecting a target wireless tag performing the wireless communications with the reader/writer, a data transmitting/receiving unit executing data transmission/reception between the selected target wireless tag and the reader/writer, and a time information writing unit writing, when completing the data transmission/reception by the data transmitting/receiving unit, the time information on completion time of the data transmission/reception to the nonvolatile storage unit, wherein the tag selection unit selects the target wireless tag from within one or the plurality of wireless tags on the basis of the time information already written by the time information writing unit through the previous data communications with the reader/writer.
7 Citations
10 Claims
-
1. A reader and writer configured to transmit and receive data, by wireless communications, to and from a wireless tag having a storage unit, said reader and writer comprising:
a control unit configured; to execute data transmission or data reception between said reader and writer and a wireless tag; to transmit completion time information indicating completion time of said data transmission or said data reception to said wireless tag, said completion time information being stored in said storage unit; and to transmit a tag selection command including time information that is used by said wireless tag to judge whether said wireless tag is selected or not by comparing said stored time information and said completion time information. - View Dependent Claims (2, 3, 4, 5)
-
6. A data communication method for radio communications between a reader and writer and a wireless tag having a storage unit, said data communication method comprising:
-
executing data transmission or data reception between said reader and writer and a wireless tag; transmitting completion time information indicating completion time of said data transmission or said data reception from said reader and writer to said wireless tag, said completion time information being stored in said storage unit; and transmitting, from said reader and writer to said wireless tag, a tag selection command including time information that is used by said wireless tag to judge whether said wireless tag is selected or not by comparing said stored time information and said completion time information. - View Dependent Claims (7, 8, 9, 10)
-
Specification