Controlling SSR

[JeanC]

I working on a project with a Duet 3 6XD and I have to control, using macros, a SSR. I still can't manage to control pins, I tried with heaters pins, fans pins and IO.
Per example, I create a pin heater : M950 H1 P1 C"out0" T1
Then I try to power the pin with M42 command but nothing happens, there is no voltage difference between the pins. Can someone guide me ?

[jay_s_uk]

@JeanC remove the H1 and T1 so its just

M950 P0 C"out0"

then use

M42 P0 S1

to turn it on