No motor control using 7i96A and DM542T drivers

I have just finished my build of a CNC table. I am using a 7i96A controller driving three axes. I cannot get any of the motor to step.
I built a configuration using PnConf , I have a tandem Y axis. I can get nothing to move regardless of which axis I try.
When I power on the system all the motor lock, as I would expect.
I am driving the DM542T differentially and I have nothing connected to the enable inputs of any of the motor driver, which should mean that they are enabled.
I put a voltage meter across the direction input of the Y axis and jogged it forward and revere. I see the input flipping between -5.95 and +4.95 so I think the direction is working but I seem not the be getting stepper pulses.
Can someone suggest the next course of action. I am a bit lost and disappointed that I spend a good deal of time and money on this project.
Anyway, I am looking for suggestions

thanks

Hirst689

Common issues are:

Too short step length (set step length to double the drives minimum)

Insufficient OPTO LED drive (use single ended wiring on OPTO inputs)

Also on later DM542Ts you must select 5V signal levels (via S2)

Thanks PCW, I found those 24/5v switches, now I have movement. Just a couple of other issues to sort out now