can you hook up an breakout expansion board to Duet Maestr

[ktapper]

So I have a Duet Maestro and an expansion break out board.

I appears that the expansion row on Maestro has a servo pin and the other needed pins to run the circuit. I have tried to connect the laser to expansion board using the four wires.

I can't seem to get the C"!servo" pin to work to run the laser.

Am I missing something?

Running RRF 3.3

Someone have config lines?

Using
M452 C"!servo" R255 F200

M3 code is not working

[Phaedrux]

You should read this carefully.

https://docs.duet3d.com/User_manual/Reference/Gcodes#m452-select-laser-device-mode

M3 is no longer used to control the laser directly.

Very important! If you use M452 to put your machine into Laser mode and are upgrading from RepRapFirmware v2.01 or earlier, you must replace all S parameters in G0/G1 commands in homing files etc. with H parameters. This is because S is now used to control laser power.
 
In RRF3, the P and I parameters are removed. Use the C parameter to select the laser control pin instead.
 
M3 and M5 no longer turn the laser on and off; use G1 Snn moves to control laser power.

[ktapper]

@phaedrux thanks read that and figured out how to manage around it. Now for the Duet 2 breakout board, can I use the Maestro to drive the circuit I need from it to make the Laser work per the documentation?

Looks like I need to know type of input the Heater pin 6 uses to use an equivalent pin on the Maestro.

[Phaedrux]

I don't think the expansion breakout board is intended for use with the Maestro.

https://docs.duet3d.com/en/Duet3D_hardware/Duet_2_family/Duet_Expansion_Breakout_Board