| 摘要 |
PURPOSE:To excellently detect a data transmission error by bringing forcibly a parity bit to logical '1' at each transmitter and bringing a reception parity bit to logical '1' at the time of the data is sent normally. CONSTITUTION:The data sent from a transmitter 9A of driver's seat and a transmitter 9A of an assistant' seat are superimposed on a data line 5 and the result is received by a receiver 11 at the assistant' seat. The transmitters 9A, 9B bring respective parity bits to logical '1' forcibly in case the data are sent normally and bring the parity bit on the data line 5 to logical '1'. The receiver 11 detect the '1' of the parity bit so as to detect the normality of the data transmission. If the data transmission has an error, the data is not outputted from the receiver 11.
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