In a data transmission system having a main controller for transmitting polling messages in a polling sequence and a plurality of terminal controllers responsive to a polling message to transmit data to the main controller, the finally polled terminal controller transmitting an END code for informing...http://www.google.fr/patents/US4574283?utm_source=gb-gplus-shareBrevet US4574283 - Data transmission system for use in an air conditioning control apparatus
Data transmission system for use in an air conditioning control apparatus
