CHECK CODE TRANSMISSION SYSTEM OF DATA TRANSMISSION USING PUSHHBUTTON DIAL SIGNAL

摘要

PURPOSE:To make it possible to send out a check code in every case, by sending out a binary code as a check code to be sent out after data transmission by dividing it into the high-order two bits and low-order two bits in terms of time. CONSTITUTION:Input data are inputted to checking circuit 4 for a bit check to obtain outputs (CECK1-CECK8). Multiplexer 6 receives check outputs CECK1 and CECK2 connected to channel A among check outputs CECK1-CECK8 sent out of checking circuit 4 with data timing pulse output END and check outputs CHCK4 and CHCK8 connected to channel B when outputs TIMG B is sent out respectively and then sends them outputs Q1 and Q2, thereby sending out a push-button dial signal, which corresponds to a check code, as the check code.