Abstract: A method for controlling cell size associated with an access point that has a receive sensitivity and an output power. The method includes changing a start of packet threshold and/or a clear channel assessment threshold to vary the cell size of the access point.

Abstract: A portable bar code scanner apparatus having a keyboard and a display mounted on the front face of the housing. The housing is configured to be held in the palm of one hand with the keys on the keyboard engageable by the thumb or fingers of the hand holding the housing. Only one hand is required for scan actuation and key entry and to maintain a comfortable precision grip. The portable bar code scanner apparatus may also include a radio for transmitting data to or receiving data from a host computer, and may be mounted on the back of the operator's hand for hands-free operation while in an object-sense mode.

Abstract: A portable bar code scanner apparatus having a keyboard and a display mounted on the front face of the housing. The housing is configured to be held in the palm of one hand with the keys on the keyboard engageable by the thumb or fingers of the hand holding the housing. Only one hand is required for scan actuation and key entry and to maintain a comfortable precision grip. The portable bar code scanner apparatus may also include a radio for transmitting data to or receiving data from a host computer, and may be mounted on the back of the operator's hand for hands-free operation while in an object-sense mode.

Abstract: A shielding assembly for a PC board having ground trace segments on a surface of the board is disclosed. The shielding assembly includes a cover, shielding assembly, a sealing gasket and a fastener. The cover includes an integrally molded base portion and a fencing portion extending outwardly from a surface of the base portion. The fencing includes peripheral edges configured to overlie the ground trace segments. The sealing gasket is disposed between the fencing and the ground trace segments. The fastener mechanically couples the cover to the PC board surface.

Abstract: A point of sale terminal is disclosed that provides all of the usual point of sale terminal functions, but that is entirely field portable. Data pertinent to each purchase can be input to the terminal via a keyboard assembly, a touch-screen display or a signature-capture screen assembly, or via an antenna and radio link from an associated bar code scanner. Data may be communicated at any time to a remote host computer, also via a separate antenna and radio link. The communication links with the host computer and the bar code scanner operate independently and simultaneously, using mutually compatible modulation schemes such as a spread spectrum scheme for the host computer link and a narrowband or spread spectrum scheme for the bar code scanner link. The terminal thereby functions as a portable repeater or node in a data communications network.

Abstract: A point of sale terminal is disclosed that provides all of the usual point of sale terminal functions, but that is entirely field portable. Data pertinent to each purchase can be input to the terminal via a keyboard assembly, a touch-screen display or a signature-capture screen assembly, or via an antenna and radio link from an associated bar code scanner. Data may be communicated at any time to a remote host computer, also via a separate antenna and radio link. The communication links with the host computer and the bar code scanner operate independently and simultaneously, using mutually compatible modulation schemes such as a spread spectrum scheme for the host computer link and a narrowband or spread spectrum scheme for the bar code scanner link. The terminal thereby functions as a portable repeater or node in a data communications network.

Abstract: A point of sale terminal is disclosed that provides all of the usual point of sale terminal functions, but that is entirely field portable. Data pertinent to each purchase can be input to the terminal via a keyboard assembly, a touch-screen display or a signature-capture screen assembly, or via an antenna and radio link from an associated bar code scanner. Data may be communicated at any time to a remote host computer, also via a separate antenna and radio link. The communication links with the host computer and the bar code scanner operate independently and simultaneously, using mutually compatible modulation schemes such as a spread spectrum scheme for the host computer link and a narrowband or spread spectrum scheme for the bar code scanner link. The terminal thereby functions as a portable repeater or node in a data communications network.

Abstract: A multiple interrupt tri-level microprocessor operating system (40) having particularly applicability in a two-way radio, includes an operating system that provides a background executive (47) to allow processing of time insensitive tasks, a foreground routine (24) to allow processing of real-time sensitive tasks, and a midground executive (41) to allow processing of time sensitive tasks. The midground executive (41) provides for periodic execution of preselected tasks, which tasks can all be completed within a predetermined period of time.