Model train wireless bi-directional communication protocol

Details Model train wireless bi-directional communication protocol Model train wireless bi-directional communication protocol

2003-11-25

2008-12-30

Anderson, Matthew D. (Department: 2618)

Multiplex communications

Duplex

Communication over free space

C370S282000, C370S329000, C370S338000, C370S382000, C370S395400, C318S268000

Reexamination Certificate

active

07471649

ABSTRACT:
Methods and apparatuses implement a bi-directional model train communications protocol compatible with existing uni-directional communications protocols. In one specific embodiment, the existing uni-directional Lionel Train Master command set is expanded utilizing the checksum error nibble to flag an alternative command signal format. This expanded command set is in turn utilized to transmit a command inquiry signal from the base unit to a specifically addressed element. The addressed element in turn transmits a response based upon the expanded command set. Older model railroad elements not configured to recognize the expanded command set, regard the command inquiry signal as a transmission error and are unaffected. Newer model railroad elements not specifically addressed by the command inquiry signal ignore the command and continue operation.

REFERENCES:
patent: 5280629 (1994-01-01), Lo Galbo et al.
patent: 6292470 (2001-09-01), Uota
patent: 2005/0285552 (2005-12-01), Grubba et al.

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