Test if sm2 red exchange mechanism behaviour is similar to sm1 one

SM1 red exchange mechanism is showing some problem since holding current has indeed been deactivated : after being set in position, either low or medium resolution, limit switch signal turns to 0 after some time.

Since none of the limit switches are activated, rexm is therefore in an unkown position.

SM2 rexm is now operational at LAM, i'm testing it to see if this behaviour is reproducible.