Patent ID: 6111889
Filing Date: 2000-08-29
Classification: H04J,H04L,H04Q

Abstract:
A master-slave data communication system in which transmission data are exchanged between a master station and a plurality of slave stations, said master-slave communication system comprising:an upward data signal line coupling said master station to said plurality of slave stations for transmitting upward data arranged on an upward data frame from each of said plurality of slave stations to said master station, said upward data frame including a common upward data message transmission subchannel shared by said plurality of slave stations for transmitting an upward data message signal and a plurality of private transmission request subchannels for said plurality of slave stations to provide a corresponding plurality of transmission request signals in said plurality of private transmission request subchannels; anda downward data signal line coupling said master station to said plurality of slave stations for transmitting downward data arranged on a downward data frame from said master station to each of said plurality of slave stations, said downward data frame including a downward data message signal and a plurality of private transmission enable subchannels for the master station to provide a transmission enable signal in one of the plurality of private transmission enable subchannels in response to at least one of said plurality of transmission request signals,wherein said plurality of slave stations establishes said upward data message signal on said common upward data transmission subchannel on said upward data frame when each of said plurality of slave stations acknowledges said transmission enable signal.