如何使用 G-Code 在 Marlin 上查看限位开关状态？
在运行 Marlin 固件的 3D 打印机主板上，你可以使用 M119 查看限位开关的当前状态。示例输出：
m119_command.txt
M119
Reporting endstop status
x_max: TRIGGERED
y_max: TRIGGERED
z_min: TRIGGERED
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