Gas alarm controller with two-way digital output interface

The utility model discloses a gas alarm controller with a two-way digital output interface, which comprises a case body, a main board, a first upper computer interface module and a terminal board are arranged in the case body, the main board is connected with the first upper computer interface module, and the first upper computer interface module is connected with the terminal board; the first upper computer interface module comprises a chip U9, a pin 1 of the chip U9 is connected with GND, the pin 1 of the chip U9 is further connected with a capacitor C50, the other end of the capacitor C50 is connected with a pin 2 of the chip U9, and the other end of the capacitor C50 is further connected with 5V voltage; a pin 9 of the chip U9 is connected with the SG, and a resistor R58 is connected between the pin 9 and a pin 13 of the chip U9; and a resistor R52 is connected between the end 1 of the common mode inductor L3 and the pin 15 of the chip U9. The controller provided by the utility model can enable a pluralit