KJT tape machine fault display, the address encoding signal is a series of pulse groups with different duty cycles. Two groups are sent each time. The two groups of pulses are received by the host and compared line by line. Only when they are identical are they confirmed to be valid. According to Different address codes decode 1-99 addresses, the fault address number is displayed digitally, and voice prompts are used at the same time. The address code transmitter can be combined with the rope pull switch, deviation switch, belt slip switch, belt tear switch, etc. according to the user's requirements to monitor the normality of the equipment in real time. Each unit can connect to 99 various monitoring points and store 10 fault point numbers for query.