Multi-logical access for a serial data link
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United States of America Patent
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Apr 27, 2004
Grant Date -
N/A
app pub date -
Dec 21, 1998
filing date -
Dec 21, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multi-logical access for a serial data link designed with a multi-logical serial interface protocol which permits multi-drop applications to communicate in a time division multiplex mode over a singular drop or physical serial link such as an RS-232 link. Data is exchanged over the serial data link between multiple applications on a transmitter side of the serial data link and multiple applications on a receiver side of the serial data link. Both the transmitter and the receiver have a link layer connected to the serial data link for handling the transmission/receiving of packets through the serial data link, for detecting the start/end of each packet, and to ensure the sequence of the packets. Both the transmitter and the receiver also have a relay layer connected between the multiple applications and the link layer, which operates to allow the different access functions to share the serial data link. Each link layer and each relay layer includes functions of protocol synchronization to provide for error-detection and error-recovery in the transmission of packets. The multi-logical access provides full duplex communication between a hand held telephone and a PC over the serial data link, wherein the portable hand held telephone and the PC each comprises a link layer and a relay layer.
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