CONTROL CIRCUIT OF PLURAL SERIAL COMMUNICATION EQUIPMENTS

摘要

PURPOSE:To communicate with plural serial communication equipment with a single control circuit by providing a line changeover means and a supervisory means between the control circuit of the serial communication equipments and circuits to be controlled so as to send the information from the communication equipment to the other communication equipment. CONSTITUTION:An input/output managing circuit 10 manages always input/ output S/P converting circuits 12-14 by using a ROM program and takes over a signal inputted to the input/output S/P converting circuits 12-13 to give an output to an optional input/output converting circuit 12, 13 or 14. In sensing a flag B by a supervisory means 10b, the input/output management circuit 10 takes over information (a) from the input/output S/P converting circuit 12 and gives it to an internal memory 10a. Then the input/output managing circuit 10 uses the set condition (b) of the supervisory means 10b to set a flag C and the information (a) is outputted to the input/output S/P converting circuit 14. The input/output S/P covnerting circuit 4 inputs the information (a) by using the flag C to gives an output to a signal line C.