In most cases, this operation is not required. We recommend that you do not set this up if possible.

If necessary, you can set the logical voltage in one of two ways:

 

1. A board with a large capacity capacitor in the end-stop input circuit, such as the Melzi

☞ If the nozzle is in contact with the bed after missing the trigger signal

☞ This setting is not required if the large capacity capacitor has already been removed from the board.

☞ Do not activate 5V logic on the 3.3V logic system without 3.3V logic conversion.

 

Step 1: Connect the 3pin (brown, red, orange) and 2pin (black, white) to the control board.

Step 2: M280 P0 S10    ← least 500ms

Step 3: M280 P0 S140   ← least 100ms

Step 4: M280 P0 S130   ← least 500ms

Step 5: Pull the push-pin with your finger so that the red LED turns off.

Step 6: M280 P0 S140   ← least 100ms

 

 

  2. Return to default (Logic voltage free) mode

☞ This operation is not necessary if you have not previously set it to 5v Logic.

 

Step 1: If your control board is a 3.3V Logic system, connect 3 pin to the control board without 2pin connections.

Step 2: M280 P0 S10    ← least 500ms

Step 3: M280 P0 S150   ← least 100ms

Step 4: M280 P0 S130   ← least 500ms

Step 5: Pull the push-pin with your finger so that the red LED turns off.

Step 6: M280 P0 S150   ← least 100ms

Step 7: The 5V Logic can damage the 3.3V Logic system.

             Therefore, For sure setting, perform 2-3 more times from Step2 to Step6.

Step 8: Connect the 2pin to the control board

 

If the correct order and minimum retention time are not observed, a retry may be required.

Logic voltage(EEPROM) remains until the new setting is completed.

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