H - Electricity – 04 – B
Patent
H - Electricity
04
B
354/234, 340/79
H04B 3/54 (2006.01) H04L 12/403 (2006.01)
Patent
CA 1196977
ABSTRACT OF THE DISCLOSURE A data transmission system for transmitting data via a power supply line includes a central processing unit, and branch terminal units connected to the central proces- sing unit via the power supply line, through which a high frequency AC signal is synchronously mixed into the AC com- mercial frequency power supply cycle so that a specific operation can be performed and the actual condition of the terminal units can be sampled and monitored during a normal operation. Emergency data signals are transmitted from any of the terminal units in a time interval during an AC power supply frequency cycle after the transmission of a polling signal and the terminal units engage in a contention for the transmission of the emergency data signals through the power supply line, the emergency data signals being received in the central processing unit during that time interval.
433531
Ise Masahiro
Machino Katsuyuki
Tanaka Hidehiko
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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