Local communication bus system and apparatuses for use in such a system
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United States of America Patent
Stats
-
Sep 29, 1998
Grant Date -
N/A
app pub date -
Mar 18, 1992
filing date -
Mar 22, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A number of domestic audio/video apparatuses (10-14) are connected to a serial control bus (D2B, 16). Each apparatus is addressable via the bus as a device and contains functional elements addressable on subdevices. One apparatus (14) includes an on-screen display subdevice (41) and a first control subdevice (24). Subdevice status messages are defined whereby a control subdevice can ask to be informed of the status of a further subdevice (e.g. 26), and in particular to be informed automatically of any change in status without the need for continuous polling of subdevices. The subdevice status messages can be used to obtain early confirmation of a signal path being established through the system.
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