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51. 发明授权

US5811786A PCMCIA card providing base unit for one-way RF signal reception and acoustic acknowledgment signal generation 失效
标题翻译： PCMCIA卡提供用于单向RF信号接收和声音确认信号生成的基本单元
公开(公告)号：US5811786A
公开(公告)日：1998-09-22
申请号：US890198
申请日：1997-07-09
申请人： George B. Rockstein , David M. Wilz , Stephen J. Colavito , Gene German , Carl Harry Knowles
发明人： George B. Rockstein , David M. Wilz , Stephen J. Colavito , Gene German , Carl Harry Knowles
IPC分类号： G02B26/10 , G06K7/10 , G06K7/14 , G06K17/00
CPC分类号： G06K7/10871 , G02B26/106 , G06K17/0022 , G06K7/10 , G06K7/10564 , G06K7/10584 , G06K7/10594 , G06K7/10603 , G06K7/10663 , G06K7/10673 , G06K7/10693 , G06K7/10702 , G06K7/10792 , G06K7/10801 , G06K7/10811 , G06K7/10851 , G06K7/10861 , G06K7/10881 , G06K7/10891 , G06K7/109 , G06K7/14 , G06K7/1443 , G06K2007/10534 , G06K2207/1012 , G06K2207/1016 , G06K2207/1017 , G06K2207/1018
摘要： A fully automatic bar code symbol reading system having at least one automatic portable bar code reading device, and an associated base unit positioned within the data transmission range thereof without a physical wiring connection thereto. In a preferred embodiment, the scanned bar code data is synthesized, packaged prior to transmitting to the base unit. The base unit generates an acoustical acknowledgment signal that is perceptible to the user of the bar code symbol reading device and the indicates that the transmitted symbol character data has been successfully received. The base unit comprises a card-like structure, a carrier signal receiving unit, a carrier signal demodulating unit, and an acoustical acknowledgment signal generating unit.
摘要翻译：一种具有至少一个自动便携式条形码读取装置的全自动条形码符号读取系统，以及位于其数据传输范围内的相关联的基本单元，而没有物理布线连接。在优选实施例中，扫描的条形码数据在传送到基本单元之前被合成，封装。基本单元生成对条形码符号读取装置的用户可感知的声音确认信号，并且指示发送的符号字符数据已被成功接收。基本单元包括卡状结构，载波信号接收单元，载波信号解调单元和声音确认信号生成单元。

52. 发明授权

US06688527B2 Bar code scanning system with wireless communication links 失效
标题翻译：具有无线通信链路的条码扫描系统
公开(公告)号：US06688527B2
公开(公告)日：2004-02-10
申请号：US09824122
申请日：2001-04-02
申请人： Carl H. Knowles , George B. Rockstein , David M. Wilz, Sr. , Stephen J. Colavito , Gennady Germaine
发明人： Carl H. Knowles , George B. Rockstein , David M. Wilz, Sr. , Stephen J. Colavito , Gennady Germaine
IPC分类号： G06K710
CPC分类号： G02B26/106 , G06K7/10 , G06K7/10564 , G06K7/10584 , G06K7/10594 , G06K7/10603 , G06K7/10663 , G06K7/10673 , G06K7/10693 , G06K7/10702 , G06K7/10792 , G06K7/10801 , G06K7/10811 , G06K7/10851 , G06K7/10861 , G06K7/10871 , G06K7/10881 , G06K7/10891 , G06K7/109 , G06K7/14 , G06K7/1443 , G06K17/0022 , G06K2007/10534 , G06K2207/1012 , G06K2207/1016 , G06K2207/1017 , G06K2207/1018
摘要： A code symbol reading device includes a portable housing that contains a source of optical energy. This optical energy is projected into a scan field external to the housing and is incident upon a code symbol situated on an object located within the scan field. Optical energy reflected off the code symbol is detected within the housing to produce scan data that is indicative of the detected optical energy. The scan data is processed to detect and decode the code symbol and to produce symbol character data that are representative of the decoded code symbol. A data packet utilizing the symbol character data is constructed and then used to modulate an electromagnetic carrier signal that is transmitted to a base unit. At the base unit, the carrier signal is demodulated and the data packet is recovered. The received data packet is processed to recover the symbol character data, and an acknowledgment signal is generated to acknowledge the receipt of the symbol character data at the base unit.
摘要翻译：代码符号读取装置包括容纳光能源的便携式外壳。该光能被投射到壳体外部的扫描场中，并入射到位于扫描场内的物体上的代码符号。在外壳内检测出代码符号反射的光能，以产生指示检测到的光能的扫描数据。处理扫描数据以检测和解码代码符号并产生代表解码的代码符号的符号字符数据。构造利用符号字符数据的数据包，然后用于调制发送到基本单元的电磁载波信号。在基本单元处，载波信号被解调并且数据包被恢复。处理所接收的数据分组以恢复符号字符数据，并产生确认信号以确认基本单元处的符号字符数据的接收。

53. 发明申请

US20080217410A1 METHOD FOR WAKING UP IN-COUNTER FIXED SCANNERS 失效
标题翻译：用于扫描计数器固定扫描仪的方法
公开(公告)号：US20080217410A1
公开(公告)日：2008-09-11
申请号：US11683065
申请日：2007-03-07
申请人： ROBERT E. BLAKE , Donald T. Hudrick , David M. Wilz , Stephen J. Colavito
发明人： ROBERT E. BLAKE , Donald T. Hudrick , David M. Wilz , Stephen J. Colavito
IPC分类号： G06K7/10
CPC分类号： G06K7/10851
摘要： A method of waking up an in-counter bar code scanner from its standby mode comprises providing a sensor assembly attached to a touch plate. The sensor assembly comprises an oscillating magnet member affixed at one end and a permanent magnet attached at an opposite free end at the end of a flexible member. When a user touches the touch plate, the impact force exerted on the touch plate is transmitted to the oscillating magnet member causing the magnet to oscillate inducing an electrical signal in a pick-up coil provided near the magnet and wakes up the bar code scanner.
摘要翻译：将柜台条形码扫描器从其待机模式唤醒的方法包括提供附接到触摸板的传感器组件。传感器组件包括固定在一端的振动磁体构件和附接在柔性构件端部的相对自由端的永磁体。当用户触摸触摸板时，施加在触摸板上的冲击力被传递到振荡磁体构件，导致磁体振荡，引起设置在磁体附近的拾取线圈中的电信号并唤醒条形码扫描器。

54. 发明授权

US07077327B1 System for reading bar code symbols using bar code readers having RF signal transmission links with base stations 失效
标题翻译：使用具有与基站的RF信号传输链路的条形码阅读器来读取条形码符号的系统
公开(公告)号：US07077327B1
公开(公告)日：2006-07-18
申请号：US09346859
申请日：1999-07-02
申请人： Carl H. Knowles , George B. Rockstein , David M. Wilz, Sr. , Stephen J. Colavito , Gennady Germaine
发明人： Carl H. Knowles , George B. Rockstein , David M. Wilz, Sr. , Stephen J. Colavito , Gennady Germaine
IPC分类号： G06K7/10
CPC分类号： G02B26/106 , G06K7/10 , G06K7/10564 , G06K7/10584 , G06K7/10594 , G06K7/10603 , G06K7/10663 , G06K7/10673 , G06K7/10693 , G06K7/10702 , G06K7/10792 , G06K7/10801 , G06K7/10811 , G06K7/10851 , G06K7/10861 , G06K7/10871 , G06K7/10881 , G06K7/10891 , G06K7/109 , G06K7/14 , G06K7/1443 , G06K17/0022 , G06K2007/10534 , G06K2207/1012 , G06K2207/1016 , G06K2207/1017 , G06K2207/1018
摘要： Disclosed is a fully automatic bar code symbol reading system having an hand-supportable laser bar code reading device which can be used in either an automatic hands-on mode of operation, or in an automatic hands-free mode of operation. The system includes a scanner support frame for supporting the hand-supportable device in a user-selected mounting position, and permits complete gripping of its handle portion prior to its use in the hands-on mode of operation. In general, the hand-supportable bar code reading device has long-range and short-range modes of object detection, bar code presence detection and bar code symbol reading. In the illustrative embodiment, the long-range mode is automatically selected when the hand-supportable bar code reading device is placed within the scanner support stand during the automatic hands-free mode of operation. Whenever the hand-supportable bar code reading device is picked up from the support stand and used in its hands-on mode of operation, the short-range mode is automatically selected to provide CCD-like scanner emulation. When used in either mode of operation, the automatic bar code reading device is capable of reading, in a consecutive manner, one or more bar code symbols on an object, while preventing multiple reading of the same bar code symbol due to dwelling of the laser scanning beam upon the bar code symbol. The automatic bar code symbol reading system of the present invention is disclosed in several different mounting arrangements at a point-of-sale station, illustrating novel methods of reading bar code symbols using the automatic hand-supportable laser scanning device of the present invention.
摘要翻译：公开了一种全自动条形码符号读取系统，其具有手持式激光条形码读取装置，其可以在自动动手操作模式或自动免手动作模式中使用。该系统包括用于在用户选择的安装位置支撑手持式装置的扫描器支撑框架，并且在其使用操作模式之前允许其手柄部分的完全抓握。通常，手持式条形码读取装置具有远程和短距离的物体检测模式，条形码存在检测和条形码符号读取。在说明性实施例中，当在自动免提操作模式期间将手持式条形码读取装置放置在扫描器支撑架内时，自动选择远程模式。每当手持式条形码读取装置从支撑架上拾取并用于其动手操作模式时，自动选择短距离模式以提供类CCD扫描器仿真。当在任何一种操作模式下使用时，自动条形码读取装置能够以连续的方式读取对象上的一个或多个条形码符号，同时防止由于激光器的居住而导致相同条形码符号的多次读取扫描光束上的条形码符号。本发明的自动条形码符号读取系统在销售点的几个不同的安装方式中公开，示出了使用本发明的自动手持式激光扫描装置读取条形码符号的新颖方法。

55. 发明授权

US6015091A System for reading bar code symbols using portable bar code symbol readers having one-way RF signal transmission links with base stations 失效
公开(公告)号：US6015091A
公开(公告)日：2000-01-18
申请号：US890576
申请日：1997-07-09
申请人： George B. Rockstein , David M. Wilz , Stephen J. Colavito , Gene German , Carl Harry Knowles
发明人： George B. Rockstein , David M. Wilz , Stephen J. Colavito , Gene German , Carl Harry Knowles
IPC分类号： G02B26/10 , G06K7/10 , G06K7/14 , G06K17/00
CPC分类号： G06K7/10871 , G02B26/106 , G06K17/0022 , G06K7/10 , G06K7/10564 , G06K7/10584 , G06K7/10594 , G06K7/10603 , G06K7/10663 , G06K7/10673 , G06K7/10693 , G06K7/10702 , G06K7/10792 , G06K7/10801 , G06K7/10811 , G06K7/10851 , G06K7/10861 , G06K7/10881 , G06K7/10891 , G06K7/109 , G06K7/14 , G06K7/1443 , G06K2007/10534 , G06K2207/1012 , G06K2207/1016 , G06K2207/1017 , G06K2207/1018
摘要： A code symbol reading device includes a portable housing that contains a light source. Light from the light source is projected into a scan field external to the housing and onto a code symbol on an object located within the scan field. The light reflected off the code symbol is detected within the housing to produce scan data that is indicative of the detected light intensity. The scan data is processed to detect and decode the code symbol and to produce symbol character data that are representative of the decoded code symbol. A data packet utilizing the symbol character data is synthesized and modulated onto a carrier signal that is transmitted to a base unit where the carrier signal is demodulated and the data packet recovered. The received data packet is analyzed to recover the symbol character data, and an acknowledgment signal is produced to acknowledge the receipt of the symbol character data at the base unit.

56. 发明授权

US5979766A Bar code symbol reading system having one-way RF signal-receiving keyboard wedge interface 失效
标题翻译：具有单向RF信号接收键盘楔形接口的条码符号读取系统
公开(公告)号：US5979766A
公开(公告)日：1999-11-09
申请号：US874221
申请日：1997-06-13
申请人： George B. Rockstein , David M. Wilz , Stephen J. Colavito , Gene German , Carl Harry Knowles
发明人： George B. Rockstein , David M. Wilz , Stephen J. Colavito , Gene German , Carl Harry Knowles
IPC分类号： G02B26/10 , G06K7/10 , G06K7/14 , G06K17/00
CPC分类号： G02B26/106 , G06K17/0022 , G06K7/10 , G06K7/10564 , G06K7/10584 , G06K7/10594 , G06K7/10603 , G06K7/10663 , G06K7/10673 , G06K7/10693 , G06K7/10702 , G06K7/10792 , G06K7/10801 , G06K7/10811 , G06K7/10851 , G06K7/10861 , G06K7/10871 , G06K7/10881 , G06K7/10891 , G06K7/109 , G06K7/14 , G06K7/1443 , G06K2007/10534 , G06K2207/1012 , G06K2207/1016 , G06K2207/1017 , G06K2207/1018
摘要： A fully automatic bar code symbol reading system is provided having at least one portable bar code symbol reading device and an associated base unit positioned within the data transmission range of the bar code reader range without a physical wiring connection between the bar code reader and the base unit. After each successful reading of a bar code symbol, the bar code reading device automatically produces symbol character data representative of the bar code symbol, synthesizes a group of data packets each containing the symbol character data, and then transmits the synthesized group of data packets to the base unit. Upon the successful receipt of one of the transmitted data packets and the recovery of symbol character data therefrom, the base unit generates an acoustic acknowledgement signal that is perceptible to the user of the bar code symbol reading device and indicates that the transmitted symbol character data has been successfully received. The base unit includes data format conversion circuitry that converts the symbol character data into the same format produced by a computer keyboard, and an interface circuit that interfaces the output port of the base unit with the keyboard input port of the host device.
摘要翻译：提供了一种全自动条形码符号读取系统，其具有位于条形码读取器范围的数据传输范围内的至少一个便携式条形码符号读取装置和相关联的基本单元，而条形码读取器和基座之间没有物理布线连接单元。每次成功读取条形码符号后，条形码读取装置自动产生代表条形码符号的符号字符数据，合成一组包含符号字符数据的数据包，然后将合成的数据包组发送到基地单位。在成功接收到所发送的数据分组中的一个和从其恢复符号字符数据之后，基本单元产生声学确认信号，该声音确认信号对于条形码符号读取装置的用户是可以察觉的，并且指示发送的符号字符数据具有已成功收到。基本单元包括将符号字符数据转换为由计算机键盘产生的相同格式的数据格式转换电路，以及将基本单元的输出端口与主机设备的键盘输入端口相连接的接口电路。

57. 发明授权

US07040540B2 Bar code scanning system with wireless communication links 失效
标题翻译：具有无线通信链路的条码扫描系统
公开(公告)号：US07040540B2
公开(公告)日：2006-05-09
申请号：US10638344
申请日：2003-08-12
申请人： Carl H. Knowles , George B. Rockstein , David M. Wilz, Sr. , Stephen J. Colavito , Gennady Germaine
发明人： Carl H. Knowles , George B. Rockstein , David M. Wilz, Sr. , Stephen J. Colavito , Gennady Germaine
IPC分类号： G06K7/10
CPC分类号： G02B26/106 , G06K7/10 , G06K7/10564 , G06K7/10584 , G06K7/10594 , G06K7/10603 , G06K7/10663 , G06K7/10673 , G06K7/10693 , G06K7/10702 , G06K7/10792 , G06K7/10801 , G06K7/10811 , G06K7/10851 , G06K7/10861 , G06K7/10871 , G06K7/10881 , G06K7/10891 , G06K7/109 , G06K7/14 , G06K7/1443 , G06K17/0022 , G06K2007/10534 , G06K2207/1012 , G06K2207/1016 , G06K2207/1017 , G06K2207/1018
摘要： A code symbol reading device includes a portable housing that contains a source of optical energy. This optical energy is projected into a scan field external to the housing and is incident upon a code symbol situated on an object located within the scan field. Optical energy reflected off the code symbol is detected within the housing to produce scan data that is indicative of the detected optical energy. The scan data is processed to detect and decode the code symbol and to produce symbol character data that are representative of the decoded code symbol. A data packet utilizing the symbol character data is constructed and then used to modulate an electromagnetic carrier sign that is transmitted to a base unit. At the base unit, the carrier signal is demodulated and the data packet is recovered. The received data packet is processed to recover the symbol character data, and an acknowledgment signal is generated to acknowledge the receipt of the symbol character data at the base unit.
摘要翻译：代码符号读取装置包括容纳光能源的便携式外壳。该光能被投射到壳体外部的扫描场中，并入射到位于扫描场内的物体上的代码符号。在外壳内检测出代码符号反射的光能，以产生指示检测到的光能的扫描数据。处理扫描数据以检测和解码代码符号并产生代表解码的代码符号的符号字符数据。构造利用符号字符数据的数据包，然后用于调制发送到基本单元的电磁载波符号。在基本单元处，载波信号被解调并且数据包被恢复。处理所接收的数据分组以恢复符号字符数据，并产生确认信号以确认基本单元处的符号字符数据的接收。

58. 发明授权

US06595420B1 Automatically-activated body-wearable laser scanning bar code symbol reading system having data-transmission activation switch 失效
标题翻译：具有数据传输激活开关的自动激活身体穿戴式激光扫描条形码符号读取系统
公开(公告)号：US06595420B1
公开(公告)日：2003-07-22
申请号：US09452976
申请日：1999-12-02
申请人： David M. Wilz, Sr. , George B. Rockstein , Robert E. Blake , Mark Schmidt , Garrett Russell , Donald T. Hudrick , Stephen J. Colavito , Carl Harry Knowles
发明人： David M. Wilz, Sr. , George B. Rockstein , Robert E. Blake , Mark Schmidt , Garrett Russell , Donald T. Hudrick , Stephen J. Colavito , Carl Harry Knowles
IPC分类号： G06K710
CPC分类号： B82Y15/00 , G06K7/10 , G06K7/10544 , G06K7/10564 , G06K7/10584 , G06K7/10594 , G06K7/10603 , G06K7/10663 , G06K7/10673 , G06K7/10693 , G06K7/10702 , G06K7/10792 , G06K7/10801 , G06K7/10811 , G06K7/10851 , G06K7/10861 , G06K7/10871 , G06K7/10881 , G06K7/10891 , G06K7/14 , G06K2207/1012
摘要： Disclosed is an automatically-activated body-wearable code symbol reading system comprising a bar code symbol reading mechanism contained within a body-wearable housing having a manually-activatable data transmission switch. During symbol reading operations, the bar code symbol reading mechanism automatically generates a visible laser scanning pattern for repeatedly reading one or more bar code symbols on an object during a bar code symbol reading cycle, and automatically generating a new symbol character data string in response to each bar code symbol read thereby. During system operation, the user visually aligns the visible laser scanning pattern with a particular bar code symbol on an object (e.g. product, bar code menu, etc.) so that the bar code symbol is scanned, detected and decoded in a cyclical manner. Each time the scanned bar code symbol is successfully read during a bar code symbol reading cycle, a new bar code symbol character string is produced, while an indicator light on the housing is actively driven. During the bar code symbol reading cycle, the user actuates the data transmission switch producing a data transmission control activation signal and enabling a currently or subsequently produced symbol character data string to be automatically selected and transmitted to the host system. By virtue of the present invention, automatically-activated body-wearable bar code symbol readers are now able to accurately read, in an unprecedented manner, bar code symbols on bar code menus, products positioned in crowded working environments, and other objects requiring automatic identification and/or information access.
摘要翻译：公开了一种自动激活的身体穿戴式代码符号读取系统，其包括包含在具有可手动激活的数据传输开关的身体穿戴式外壳内的条形码符号读取机构。在符号读取操作期间，条形码符号读取机构自动生成可见激光扫描图案，用于在条形码符号读取周期期间重复读取对象上的一个或多个条形码符号，并响应于该条形码符号读取周期自动生成新的符号字符数据串每个条码符号读取。在系统操作期间，用户将可见激光扫描图案与物体上的特定条形码符号（例如产品，条形码菜单等）视觉对准，使得条形码符号以循环方式被扫描，检测和解码。每次在条形码符号读取循环中成功读取扫描的条形码符号时，产生新的条形码符号字符串，同时主动地驱动壳体上的指示灯。在条形码符号读取周期期间，用户致动数据传输开关，产生数据传输控制激活信号，并使当前或随后产生的符号字符数据串被自动选择并发送到主机系统。凭借本发明，自动激活的身体穿戴式条形码符号读取器现在能够以前所未有的方式准确地读取条形码菜单上的条形码符号，位于拥挤的工作环境中的产品以及需要自动识别的其他对象和/或信息访问。

59. 发明授权

US5939701A Bar code symbol reading system having cordless bar code symbol reader and portable base unit with data collection memory and acoustical acknowledgment signal generator 失效
标题翻译：具有无绳条形码符号读取器和具有数据采集存储器和声音确认信号发生器的便携式基本单元的条形码符号读取系统
公开(公告)号：US5939701A
公开(公告)日：1999-08-17
申请号：US890586
申请日：1997-07-09
申请人： George B. Rockstein , David M. Wilz , Stephen J. Colavito , Gene German , Carl Harry Knowles
发明人： George B. Rockstein , David M. Wilz , Stephen J. Colavito , Gene German , Carl Harry Knowles
IPC分类号： G02B26/10 , G06K7/10 , G06K7/14 , G06K17/00
CPC分类号： G06K7/10871 , G02B26/106 , G06K17/0022 , G06K7/10 , G06K7/10564 , G06K7/10584 , G06K7/10594 , G06K7/10603 , G06K7/10663 , G06K7/10673 , G06K7/10693 , G06K7/10702 , G06K7/10792 , G06K7/10801 , G06K7/10811 , G06K7/10851 , G06K7/10861 , G06K7/10881 , G06K7/10891 , G06K7/109 , G06K7/14 , G06K7/1443 , G06K2007/10534 , G06K2207/1012 , G06K2207/1016 , G06K2207/1017 , G06K2207/1018
摘要： A bar code symbol reading system is provided having at least one portable bar code symbol reading device and an associated base unit positioned within the data transmission range thereof without a physical wiring connection thereto. After each successful reading of a bar code symbol, the bar code reading device automatically produces symbol character data representative of the bar code symbol, synthesizes a group of data packets each containing the symbol character data, and then transmits the synthesized group of data packets to the base unit. Upon the successful receipt of one of the transmitted data packets and the recovery of symbol character data therefrom, the base unit generates an acoustic acknowledgment signal that is perceptible to the user of the bar code symbol reading device and indicates the transmitted symbol character data has been successfully received.
摘要翻译：提供一种条形码符号读取系统，其具有位于数据传输范围内的至少一个便携式条形码符号读取装置和相关联的基本单元，而不与其物理布线连接。每次成功读取条形码符号后，条形码读取装置自动产生代表条形码符号的符号字符数据，合成一组包含符号字符数据的数据包，然后将合成的数据包组发送到基地单位。在成功地接收到所发送的数据分组之一并从中恢复符号字符数据之后，基本单元产生声学确认信号，该声音确认信号对条形码符号读取装置的用户是可感知的，并且指示发送的符号字符数据已被成功收到。

60. 发明授权

US5929419A System and method for preventing authorized movement of cordless bar code symbol readers from designated scanning environments 失效
标题翻译：用于防止无绳条形码符号读取器从指定扫描环境中未经授权移动的系统和方法
公开(公告)号：US5929419A
公开(公告)日：1999-07-27
申请号：US890085
申请日：1997-07-09
申请人： George B. Rockstein , David M. Wilz , Stephen J. Colavito , Gene German , Carl Harry Knowles
发明人： George B. Rockstein , David M. Wilz , Stephen J. Colavito , Gene German , Carl Harry Knowles
IPC分类号： G02B26/10 , G06K7/10 , G06K7/14 , G06K17/00
CPC分类号： G06K7/10871 , G02B26/106 , G06K17/0022 , G06K7/10 , G06K7/10564 , G06K7/10584 , G06K7/10594 , G06K7/10603 , G06K7/10663 , G06K7/10673 , G06K7/10693 , G06K7/10702 , G06K7/10792 , G06K7/10801 , G06K7/10811 , G06K7/10851 , G06K7/10861 , G06K7/10881 , G06K7/10891 , G06K7/109 , G06K7/14 , G06K7/1443 , G06K2007/10534 , G06K2207/1012 , G06K2207/1016 , G06K2207/1017 , G06K2207/1018
摘要： Disclosed is a fully automatic bar code reading system having at least one automatic (i.e., triggerless) portable bar code symbol reading device, and an associated base unit positioned within the data transmission range thereof without a physical wiring connection thereto. After each successful reading of a bar code symbol, the bar code symbol reading device automatically produces symbol character data representative of the decoded bar code symbol, synthesizes a group of data packets each containing the symbol character data, and then transmits the synthesized group of data packets to the base unit. Upon the successful receipt of one of the transmitted data packets and the recovery of symbol character data therefrom, the base unit generates an acoustical acknowledgement signal that is perceptible to the user of the bar code symbol reading device and indicates the transmitted symbol character data has been successfully received. In typical applications, a plurality of such bar code systems are used in physical proximity with each other, such as in conventional retail point-of-purchase (POS) environments. In accordance with the present invention, radio frequency (RF) carrier signals of the same frequency are used by each hand-supportable bar code symbol reading device to transmit groups of data packets to respective base units. Data packet interference at each base unit is minimized during data packet reception by using a novel data packet transmission scheme. In accordance therewith, each bar code symbol reading device transmits the data packets in each of its data packet groups with a unique time delay imposed therebetween, thus creating data packet transmission "slots" or "windows" on the time domain, during which other groups of data packets may be transmitted from neighboring bar code symbol reading devices and received at their respective base units.
摘要翻译：手提式外壳包括条形码符号读取器。电动被动目标被固定到手持式外壳上，该手持式外壳与无形电磁询问字段交互，以在条形码符号读取器通过询问字段时产生报警信号。

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