clunks / missing steps - DM856 and single pulse operation

[dsc]

Ok I've done some testing and I'm not sure what's going on. For starters I've connected the PIC to the DM856 and done some scoping:



This is the pulse when connected to the DM856, width 41us, nothing fancy jumps out. The back of the pulse overshoots a bit, not sure whether that matters:



Here's a Pulse vs Dir screenshot, again around 55us difference between the two, DIR being changed first as per the manual:



Afterwards I followed Gary's (Zapp) suggestion and connected the PIC to a different driver, this time a bigger HBS86 coupled with a bigger Nema 34 motor (with an encoder). For starters I got a lot of noise on the pulse and direction lines, but I had all sorts of cables on the bench, crossed etc.:



Here's a pulse vs direction screenshot, all looking steady (well apart from noise):



And here's a video showing how the motor moves when the buttons are pressed:


[video should work now]

Compared to the previous video this is steady, no jump backs, no sudden movement. A bit noisy I have to say, it clunks every time, but it's a bigger motor. Is this good behaviour?

I've started looking at the configuration of the DM856 but whenever I try to connect to the driver via RS232 it looses connection. I will try on a laptop at work tomorrow.

Regards,
T.