Packet data communication system

Details Packet data communication system Packet data communication system

H - Electricity

04

B

H04B 7/24 (2006.01) G06K 17/00 (2006.01) H04L 12/28 (2006.01) H04L 12/56 (2006.01)

Patent

CA 2051212

A packet data transmission system is used to link a number of remote hand- held data-gathering units such as bar code readers to a central computer which maintains a database management system. Data packets are sent from the remote units by an RF link to intermediate base stations, then sent by the base stations to the central computer by a serial link. Direct sequence spread spectrum modulation is used for the RF link. The remote hand-held units initiate an exchange using RF transmission to and from the base stations, receiving only during a rigid time window following a transmission from the remote unit. The base stations cannot initiate communication to the remote units, but instead send data to the remote units only as part of the exchange.

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