Abstract: A wireless modem includes a radio transceiver and microprocessor-based controlling circuitry. Two or more modems can be individually ported to host computer devices to link them within a computer local area network. Computer data is broadcast in discreet packets which individually contain address information and error detection information that can be processed by the receiving modem. Each modem is programmed to normally operate in a standby receiving condition. Broadcast signals are processed and decoded by the addressed modem prior to being converted to a machine readable format for transfer to a host computer device. The receipt of one packet of data must be verified by the receiving modem before a transmitting modem can broadcast a subsequent packet. Test systems are also provided for monitoring the operational status of a local area network without requiring operational use of host computer devices ported to the modems within the network.

Abstract: An optical scanner for indicia arranged in a focal plane perpendicular to an optical system including a rotatable dove prism. The dove prism transmits a rotating image to a stationary photodiode array.

Abstract: An optical scanner for indicia arranged in a focal plane at a cylindrical outside surface by use of an optical system including a rotatable dove prism. The dove prism transmits a rotating image of an encircled cylindrical surface area to a stationary photodiode array.