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Revision to Connecting endstop switches

Harald Wagener (oliof)

The endstop switches each need to be able to sink 1.5mA current for the Duet 2 WiFi and Duet 2 Ethernet, 0.3mA for the Duet 2 Maestro, and 2.1mA for the Duet 06 or 085. This is not usually a problem, except with some optical endstop switches that were not designed properly for 3.3V operation.
 
'''Note:''' some types of endstop (e.g. opto endstops designed for 5V operation) mymay pull the endstop input low enough to light the LED, but not low enough for the Duet to recognise that the input is in the LOW state.
'''Note:''' some types of endstop (e.g. opto endstops designed for 5V operation) mymay pull the endstop input low enough to light the LED, but not low enough for the Duet to recognise that the input is in the LOW state.
 
Each axis endstop input can be configured in firmware for a Max (high end of axis) or Min (low end of axis) endstop, and with an active high or active low signal level. Configuration is done in config.g using the M574 command.

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