Patent ID: 6456191
Filing Date: 2002-09-24
Classification: G06K

Abstract:
A system of communicating between a master communication device and at least one slave communication device for determining if said at least one slave is within a field of coverage and for identifying said slave, the system comprising:a master communication device having transmitting and receiving means, said master establishing a field of coverage and initiating communications with slave communication devices within said field of coverage; at least one slave communication device having transmitting and receiving means and a binary identification number, said at least one slave communicating with said master to provide said binary identification number; and said master sending a command to said at least one slave for said at least one slave to provide said binary identification number, and said at least one slave receiving said command and providing information representative of bits of said unique binary identification number to said master in a bit-by-bit manner, said slave continuing transmission of said information only during receipt of acknowledgments of each bit from said master.