The embedded digital tube sends a frame of communication code to the device to make all the eight-digit tubes turn off and on.

If there is an MCU or microcontroller on the digital tube side, you can define this communication code yourself. For example, you can define STM32 to send a 0x20 to the digital tube side, and then the MCU on the digital tube side receives it. , make a judgment, if it is 0x20, the MCU controls the digital tube to turn off.