![]() ![]() ![]() $1 - Step idle delay, millisecondsĮvery time your steppers complete a motion and come to a stop, Grbl will delay disabling the steppers by this value. We recommend something around 10 microseconds, which is the default value. If the pulses are too long, you might run into trouble when running the system at very high feed and pulse rates, because the step pulses can begin to overlap each other. You want the shortest pulses the stepper drivers can reliably recognize. Check the data sheet or just try some numbers. Stepper drivers are rated for a certain minimum step pulse length. NOTE: From Grbl v0.9 to Grbl v1.1, only $10 status reports changed and new $30/ $31 spindle rpm max/min and $32 laser mode settings were added. Grbl's $x=val settings and what they mean You can check if Grbl has received and stored your setting correctly by typing $$ to view the system settings again. If everything went well, Grbl will respond with an 'ok' and this setting is stored in EEPROM and will be retained forever or until you change them. However, most good GUIs will help out by attaching descriptions for you, so you know what you are looking at. This was done to free up precious flash memory to add the new features available in v1.1. In prior versions of Grbl, each setting had a description next to it in () parentheses, but Grbl v1.1+ no longer includes them unfortunately. The x of $x=val indicates a particular setting, while val is the setting value. ![]() All of these settings are persistent and kept in EEPROM, so if you power down, these will be loaded back up the next time you power up your Arduino. Grbl should respond with a list of the current system settings, as shown in the example below. ![]() To view the settings, type $$ and press enter after connecting to Grbl. These either immediately change Grbl's running behavior or immediately print a report of the important realtime data like current position (aka DRO). The last four non-'$' commands are realtime control commands that can be sent at anytime, no matter what Grbl is doing. The ‘$’-commands are Grbl system commands used to tweak the settings, view or change Grbl's states and running modes, and start a homing cycle. ![]()
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