Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2001-04-17
2004-11-09
Frech, Karl D (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
C235S462450
Reexamination Certificate
active
06814293
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention generally relates to an arrangement for and a method of establishing a logical relationship among peripherals in a wireless local area network, the peripherals being in communication with one another and with a system manager for managing the network by a low power, wireless, radio frequency, communications protocol.
2. Description of the Related Art
Logical networks or virtual local area networks (LANs) are becoming increasingly important as LANs are interconnected with metropolitan or global networks which, in turn, have their own local area networks. In a physical local area network, all of the hosts in the LAN are physically connected to the same LAN cable or wire pair. In a logical network, a particular set of arbitrary hosts throughout the entire network is selected as a closed group. That is, hosts physically located in different local subnetworks may be logically connected as a single virtual LAN. This closed group is administered as a logical LAN independent of other groups of hosts. In the Internet, these logical LANs are referred to as logical IP subnets (LIS). Typically, a LIS requires manual configuration of each host by LAN administrators of each LAN where a logical LAN host is physically located.
U.S. Pat. No. 5,751,967 describes methods and apparatus for automatic configuration of switched networks implementing virtual local area networks (VLANs). Standard networking devices such as “concentrators” or “hubs” which have a plurality of ports for connecting to different types of network cables such as fiber optic cable, unshielded twisted pair cable and shielded twisted pair cable may be used in conjunction with software for creating the virtual network. Typically, such software code is executed at run-time in a single networking device and interacts with software for communication in other networking devices, although such features may be implemented in any variety of dedicated hardware devices in a networking device including, but not limited to, discrete logic circuits, large scale integrated circuits (VLSIs) or application-specific integrated circuits (ASICs).
The switched networking system may include a variety of technologies, for example, those employing either configuration-switched, frame-switched or cell-switched devices, any one or more of which can support the creation of VLANs.
Virtual auto-configuration (VAC) is a management tool implemented as a series of executable routines which are operative within a single device (e.g., NCE) in a switched networking system. Active within the device is a process known as the virtual auto-configuration daemon (VAC deamon) process which is responsible for managing all the VLAN devices in the switched inter-network via communication with software process resident in those devices. A virtual auto-configuration manager interacts with the daemon process wherein the network manager may set up various virtual local area networks in the switched inter-network by defining “policies” within manager processes. Policies are broadly defined as rules which specify how end-stations within the switched network should be grouped into VLANs. Policies are maintained using a policy configuration user interface which is resident within the VAC manager.
For example, a network manager may specify that all end-stations having predetermined media access control (MAC) addressed within a specified range are members of the same VLAN. Other policies may be defined based on any polled network data. Policies may be defined in any number of ways including, but not limited to, the use of a graphical user interface (GUI) using well-known techniques for creating tables with values/strings and other data times for populating tables specifying the policies. With communication with the VAC daemon process, a networks management station may also present a graphical display to the network manager of the virtual networks in the system. This may be done using any number of techniques, for example, a text list mapping VLANs to names or a graphical user interface displaying the physical configuration of the network (topology) and end-stations.
Such logical networks comprise, among other things, a plurality of components, devices, and other peripherals that cooperate and interact in a logical or working relationship. There may be multiples of each such peripheral, in which case, the identity of each such peripheral is critical for proper network operation.
One example of such multiple peripheral networks is an electro-optical reader for reading indicia such as bar code symbols appearing on a label or on a surface of an article. In its simplest form, the symbol itself is a coded pattern of indicia comprised of, for example, a series of bars of various widths spaced apart from one another to bound spaces of various widths, the bars and spaces having different light reflecting characteristics.
The scanning of bar code patterns has become more complex as bar code patterns have become both more complex and more compact. The typical bar code pattern includes lines and spaces of different widths extending in an x direction, and can be scanned by one or more linear scans in the x direction. Moreover, because the direction of the scan is not always precisely aligned with the direction of the bar code pattern, more complex omnidirectional scanning patterns are sometimes used, wherein consecutive scan lines are angularly displaced relative to one another to form a complex omnidirectional scanning pattern. Two dimensional (2D) bar code patterns (Code 49) have also been introduced wherein, in addition to a typical bar code pattern having lines and spaces of varying widths along an x direction, typical bar code patterns are stacked one upon the other in the y direction to form the 2D bar code pattern. Accordingly, scanning of a 2D bar code pattern is more complex, and requires a raster type of scan wherein consecutive x direction scans are displaced in the y direction by the spacing between stacked rows of the 2D bar code pattern to form a raster scan.
The readers and scanning systems electro-optically transform the graphic indicia into electrical signals, which are decoded into alphanumerical characters that are intended to be descriptive of the article or some characteristic thereof. Such characters are typically represented in digital form and utilized as an input to a data processing system for applications in point-of-sale processing, inventory control, and the like. Scanning systems of this general type have been disclosed, for example, in U.S. Pat. Nos. 4,251,798; 4,369,361; 4,387,297; 4,409,470; 4,760,248; and 4,896,026, all of which have been commonly assigned to the same assignee as the present application.
As disclosed in some of the above patents, one embodiment of such a scanning system resides, inter alia, in a portable laser scanner which is grasped and hand-held by a user, which is designed to allow the user to aim the scanner, and more particularly, a light beam emanating therefrom, at a target bar code symbol to be read.
In prior art bar code scanners, the light source in a laser scanner is typically a gas laser or semiconductor laser. The use of a semiconductor device such as a laser diode as the light source in scanning systems is especially desirable because of its small size, low cost and low power requirements. The laser beam is optically modified, typically by a lens, to form a beam spot of a certain size at the target distance. It is preferred that the beam spot size at the target distance be approximately the same as the minimum width between regions of different light reflectivity, i.e., the bars and spaces of the symbol.
Bar code symbols are formed from bars or elements that are typically rectangular in shape with a variety of possible widths. The specific arrangement of elements defines the character represented according to a set of rules and definitions specified by the code or symbology used. The relative size of the bars and spaces is determined by the type of coding used
Bridgelall Raj
Curry Daniel
Hamilton Alistair R.
Oppenheim Ellen
Ryder Michael
Frech Karl D
Kirschstein et al.
Symbol Technologies Inc.
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