Self-diagnosis and system protection device for 485 communication IC application system and its control method

摘要

The present invention relates to a self-diagnosis and system protection device of the 485 communication IC application system and a control method thereof, and in particular, a 485 communication IC (100) for transmitting high-speed data; A first resistor 200 which prevents current from leaking to the power source; A first switching unit 300 mounted on the first line to perform an on / off operation; A second resistor 400 preventing current from flowing to ground; A second switching unit 500 mounted on a second line to perform an on / off operation; A third resistor 600 which prevents current from flowing between the first line and the second line; A third switching unit 600 performing an on / off operation; A CPU unit 800 for outputting an LED control signal and controlling on / off operations of the first switching unit 300, the second switching unit 500, and the third switching unit 700; It characterized in that it comprises a LED unit 900 that is lit by the LED control signal applied from the CPU unit 800, the present invention is equipped with a self-diagnosis and system protection device in the 485 communication IC application system, It can prevent the 485 communication IC application system from operating abnormally by detecting an error in the wiring or the 485 communication IC application system itself, and the dead phenomenon in which all the interlocked systems do not operate and the current consumption of the 485 communication IC itself. This prevents the 485 communication IC application system from crashing in advance.