Instrument bus converting circuit with short circuit self preservation protects function

The utility model relates to an instrument bus converting circuit with short circuit self preservation protects function, this circuit contains TTL changes instrument bus module, the TTL module is changeed to the instrument bus, short circuit overload detection module and short -circuit protection module, the TTL transmitting terminal is connected with the input that TTL changes instrument bus module, TTL changes instrument bus module's output and is connected through the first clock signal of the 9th resistance with the instrument bus, first clock signal still is connected with the input of instrument bus commentaries on classics TTL module, the instrument bus is changeed the output of TTL module and is connected with the TTL receiving terminal, TTL changes instrument bus module's output and the first clock signal of instrument bus is connected with two inputs of short circuit overload detection module respectively, short circuit overload detection module's output is connected with the input of short -circuit protection module, the output contact of short -circuit protection module and the second signal line connection of instrument bus, the utility model discloses simple structure, with low costs, stability and reliability are all very high.