PURPOSE:To quickly and accurately forecast trouble by transmitting the trouble information together with its importance code from a data terminal equipment. CONSTITUTION:A data terminal equipment 6 collects the trouble information and sends them to a host computer 2. In this case, a code adding part 8 adding the importance codes to those trouble information to show the importance decided previously based on the factor of each trouble is provided. Thus all trouble information are added with the importance codes and sent to the computer 2. The computer 2 sorts the trouble information for each code through a code-based sorting part 3. Those information bearing the 'importance' codes are displayed directly on a warning display device 4' via an important trouble warning part 4. While other trouble information are accumulated and then outputted as the important troubles only when the number of these troubles reaches a limit level set previously.
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