| 摘要 |
PURPOSE:To establish the semi-duplex transmission mode with a simple constitution, by picking up the specific pattern for carrier information transmission in the reception data of the low speed MODEM at the terminal unit side and outputting the carrier signal to the terminal unit. CONSTITUTION:The transmission request information at CPU 11 responds the carrier detection information of the terminal unit 16, to perform the operation of semi-duplex transmission mode between the units 16 for CPU 11. The pattern detector 17 is placed between the low speed MODEM 15 and the unit 16, the specific pattern for carrier information transmission in the reception data of the low speed MODEM 15 at the unit 16 side is picked up, and the carrier detection signal is outputted to the unit 16. Thus, the semi-duplex transmission mode is established with a simple constitution. |
