TDMA MONITOR DEVICE

PURPOSE:To monitor at the master station side in distinguishing the trouble of device or the like in the slave station side from cut-off of power source by transmitting power-off information from the slave station to the master station without waiting access from the master station when power of the slave station is supplied. CONSTITUTION:In each slave station, an AC power source voltage is inputted to a power supply circuit 4 from a power supply terminal 1 through a switch 2, and the power supply circuit 4 rectifies the inputted AC voltage and converts it to a DC voltage required for the operation of a TDMA circuit 5 and supplies it to the TDMA circuit 5. The TDMA circuit 5 receives signals on the burst assigned to the slave station itself on a basis of a frame signal transmitted from a master station 6 and transmits transmission signals to the assigned burst. A power-off detecting means 3 outputs power-on/off information and supplies it to the TDMA circuit. Prescribed bits on assigned bursts of individual slave stations are monitored in the master station side to recognize that power is normally supplied to individual slave stations.