Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Patent
1997-10-09
2000-12-19
Pham, Chi H.
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
370349, H04L 1228, H04J 324
Patent
active
061635383
ABSTRACT:
A pair of compact, energy-efficient, intelligent, wireless transceiver units are designed to replace the cable that interconnects a portable bar-code scanner, keyboard, and display or other host to a portable bar-code printer or the like. When reset, the units exchange linkage packets and thereby exchange addresses. Thereafter, the two units communicate in an error-free fashion with each other, even in the presence of noise and interference, by exchanging addressed packets containing error detection information. Alternate transmission frequencies are selected when transmissions cannot be received at one frequency. The host unit may maintain independent linkages with multiple printers or the like, with a switch on the host unit selecting the desired printer. Power usage is minimized by shutting down transmitters, receivers, serial port drivers, and microprocessors whenever possible, and for extended periods when data is not being transmitted.
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Johnson, et al.; U.S. application No. 08/502,612, filed: Jul. 14, 1995; Group Art Unit 2415 Mobile Multi-Printer Station Printing Barcode Labels and Signs.
Brown John P.
Morrison Donald A.
Tincher Terry L.
Monarch Marketing Systems, Inc.
Pham Brenda H.
Pham Chi H.
Sprowl James A.
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