Using a 3nm stepper from Gary with the above driver powered by 2 ps407 power supplies in series. Anyone know the correct dip switch position for switch 4? Off is half current, on is full current.

Reason I ask is all the drivers I bought from Zapp before came setup with switch 4 off but this one came with it on and having no idea what position it should be in plus my legendary smoke releasing skill, I thought I'd better enquire.....

Jeff.