flexi-bot/docs/marlin/_gcode/M575.md

tag	title	brief	author	since	requires	group	codes	notes	parameters	examples
m0575	Serial baud rate	Change the serial baud rate	thinkyhead	2.0.0	BAUD_RATE_GCODE	hosts	M575	Only specified baud rates are allowed. Shorthand baud rates (shown below in parentheses) were added in 2.0.6.1.	tag optional description P true Serial Port index. Omit for all serial ports. tag optional description values B false The baud rate to set. Permitted values are: - 2400 (24) - 9600 (96) - 19200 (19, 192) - 38400 (38, 384) - 57600 (57, 576) - 115200 (115, 1152) - 250000 (250) - 500000 (500) - 1000000 tag baud	pre code Set the baud rate for port 0 to 115.2K M575 P0 B115200 pre code Set the baud rate of all ports to 250K M575 B250000

Change the baud rate of one serial port or all serial ports. This command will interrupt serial communication to the host and may reset the firmware when the host reconnects at the new baud rate.