The data format is 4 digits less than 4 digits using 0 complement 追蹤

锋权 周

The data format is 4 bits less than 4 digits, using 0 to complement,
When using the serial number, enter a value of 0, then the system displays 0001.
When you enter 300, 0300 is displayed.
That is, when the format is 4 bits, the 0 point is used.