公开(公告)号：US20040227616A1

公开(公告)日：2004-11-18

申请号：US10439641

申请日：2003-05-16

Applicant: Mark IV Industries Limited

Inventor： Robert Lafferty

IPC: H04Q001/00 ,  G05B019/00

CPC classification number: G07B15/063

Abstract: A handheld reader for testing the validity of a transponder in a mobile communications system, such as an electronic toll collection system. The handheld reader interrogates the transponder under test and receives a response signal. The response signal contains a data string having a sequential plurality of fields, including one field earlier in the sequence than another field. The handheld reader tests the later field for validity and, if invalid, tests the earlier field for validity. Based upon the results of the tests, the handheld reader outputs an indicator signal that provides an assessment of the degree of validity of the data string.

Abstract translation: 一种用于测试移动通信系统（例如电子收费系统）中的应答器的有效性的手持式读取器。 手持读取器询问被测应答器，并接收响应信号。 响应信号包含具有顺序多个字段的数据串，包括序列中比另一个字段更早的一个字段。 手持读取器测试后续字段的有效性，如果无效，则测试早期字段的有效性。 基于测试结果，手持读取器输出指示符信号，其提供对数据串的有效程度的评估。