| 摘要 |
PURPOSE:To execute easily communication supervision without exerting effect on a main function by connecting a communication supervisory device to a part of a line adaptor similarly as a terminal device correspondingly and reading sequentially line data at each scanning connection without the provision of any special signal branch connecting means. CONSTITUTION:Plural terminal devices 30-3n-1 and one communication supervisory device 4 are connected to a CPU1 of a data communication system via a communication controller 2. Line adaptors 3b, 231-23n-1 corresponding to the terminal devices 30-3n-1 are connected to the device 2 and also the line adaptor 23n is connected to the device 4. The line adaptors 3b, 231-23n are connected to the control section 21a connected to the CPU1 via a switch section 24. A storage section 22 storing a data relating the line connection control is connected to the control section 21a. Then the device 4 is connected to the switch section 24 the same as the terminal devices 30-3n-1 without provision of any special signal branch means, the line data is read sequentially at each scanning connection to execute supervisory of communication easily. |
