CONTROL SYSTEM FOR PUSH-BUTTON TELEPHONE SET

摘要

PURPOSE:To reduce the burden for controlling a main processor by providing a first means for transferring simultaneous command data from a main equipment to all telephone sets and a second means for transferring individual command data between the main equipment and the respective telephone sets and controlling a lamp display by the use of the first and the second means by the main equipment. CONSTITUTION:A main control part CC respectively transmits a trunk line CO1 using signal through the DR0 channel of all buses and a trunk line CO1 self-using signal through the DR1 channel of the bus connected to a caller telephone set KT10. The first signal is received by all the telephone sets in a system. The respective telephone sets decide whether the button and the lamp corresponding to the trunk line CO1 are present in its own telephone set or not according to a line data table LDT and if there are corresponding ones, the lamp is constantly lighted. The second signal is received only by the caller telephone set KT10. The microprocessor KTP of the caller telephone set responds to this signal, and changes the trunk line lamp once set to the constant lighting state to a flashing display indicating its own using state.