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Revision to Wiring and hardware differences from RAMPS etc

Tony

* One bed heater wire to the BED- pin on the Duet bed heater terminal block
* Other bed heater wire to the +ve output of the bed heater PSU
* -ve output of the bed heater PSU to the -ve side of the [[Glossary_of_Terms#VIN|VIN]]VIN terminal block (marked GND) (the -ve input from the main power supply goes here too).
* -ve output of the bed heater PSU to the -ve side of the [[Glossary_of_Terms#VIN|VIN]]VIN terminal block (marked GND) (the -ve input from the main power supply goes here too).
* Do not connect the bed heater PSU +ve output to the Duet.
 
 
* A probe with an analog output is connected to the connector labelled PROBE. The advantage of these types of probe is that the firmware can slow down the probing speed as the trigger height is approached. The voltage fed into the input pin must not exceed 3.3V.
* Probes with a digital output are connected may be connected either to the PROBE connector or to the E0 [[Glossary_of_Terms#Endstop|endstop]]endstop switch input. The pin connections for the E0 switch inputs are not the same as for RAMPS (see earlier), and the voltage fed into the STP input must not exceed 3.3V.
* Probes with a digital output are connected may be connected either to the PROBE connector or to the E0 [[Glossary_of_Terms#Endstop|endstop]]endstop switch input. The pin connections for the E0 switch inputs are not the same as for RAMPS (see earlier), and the voltage fed into the STP input must not exceed 3.3V.
 
Servo-deployed probes can be used, but the signal level for the servo output signal is 3.3V. If your servo needs a 5V signal, you will have to use an external buffer or level-shifter.

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