Use of non-expansion board pins

[LewisB]

I'm looking to have two controllable 24V pins on the DuetEthernet and was originally trying to reassign heaters 1 and 2 as the source through disabling them in the firmware using:

M307 H1 A-1 C-1 D-1
M307 H2 A-1 C-1 D-1

and then using

M42 P1 S255
G4 P1000
M42 P2 S255
G4 P1000

in the print G-code. It seems like I'm getting a millisecond of voltage spike when the M42 is encountered, but then it seems to instantly turn off. Are the original heater sources unable to be used as I/O pins or is the G-Code incorrect?

[dc42]

It sounds as though the heater protection mechanism is kicking in. Make sure you have no tools configured to use heater 1 or 2.

[LewisB]

That was it! thank you so much!