A reader (10) capable of efficiently reading tags (12) of differing protocols in a radio frequency identification system. The tag may be either a full-duplex tag or a half-duplex tag. The reader includes a display (16), a power switch (18) and a read switch (20) for enabling operation of the reader by a user. The reader further includes a coil (60); a driver circuit (32) coupled to the coil; and a signal analyzing circuit (82, 84, 90) coupled to the coil. The signal analyzing circuit analyzes tag identification signals sensed by the coil by detecting an initial data sequence of the tag identification signals and selecting from at least two different protocols the correct protocol of the tag identification signal.
申请公布号
WO9852168(A3)
申请公布日期
1999.02.18
申请号
WO1998US10136
申请日期
1998.05.14
申请人
AVID IDENTIFICATION SYSTEMS, INC.;LU, GUIYANG;CRUZ, MICHAEL, F.;TROESCH, PETER