| 摘要 |
PURPOSE:To make it possible to surely receive binary code information on the side of a receiver by generating a preamble signal for prescribed time between the occurrence of a signal for equalization and a binary code information signal. CONSTITUTION:At first, a data transmission request signal RS is outputted to a signal line 10a. Next, a modem 4 is set, to R transmission mode and a transmission request is performed. When a long training modem signal is outputted to a signal line 10c, an equalization is performed for the modem demodulation part on the side of a receiver and the modem 4 becomes a data transmission possible state, a transmission is terminated. A NCU 10 starts a second timer 8. Whether the buffer near the control circuit of a P/S conversion circuit 6 becomes null or not is judged and a flag or 7EH data is outputted when it is null. When it is not null, whether time is up in the timer 8 or not is judged, and when time is up, the transmission of binary code information is executed. In the binary code information, the signal showing a transmission procedure is contained and the frame constitution of a HDLC is used. |
