| 摘要 |
PURPOSE:To make data transmission of wide range transmission speed possible without requiring large number of MODEM by finding unit data length of transmitted data using a reference clock, discriminating transmitted data from the value, and making corresponding data processing. CONSTITUTION:A crystal oscillator 2 generates a reference clock signal. Transmitting side sends out reference data frequency modulated '1', '0' data, before transmitting data to indicate a portrait. The reference data are given to a CPU 1. When the reference data are the first reading, unit data length of '0' is found by a counter 8. The counted value is stored in the counter area CM of an RAM by control of the CPU 1. In the case where ordinary data are transmitted, '1', '0' of the inputted ordinary data is discriminated basing on the number of counter stored in the area CM. When discrimination of data equivalent to one word is finished, processing to store corresponding data is performed. |
