SimpleStep motor controller board

[nyc_(is_out_of_here)]

Update:

Turns out to be a hardware issue.

We have two USB-serial cables. One has a Prolific chipset. The other has a different chipset.

The one with the Prolific chipset works fine.

The other doesn't. It's driver may not be quite compatible with Windows 8.1.

Though it worked fine with a different piece of equipment.

The cable with the Prolific chipset was recognized instantly in Windows 8.1

[Albert.Geven]

good work

Expected that from you.

[Henrik_Volkers]

Can you check the handshake lines?

Sometimes (when some galvanic isolation is involved) you need to 'power' the rs232 circuit in the device.

NEXT: REALLY check your cable!!

Do you have switched and or high power devices near ?  (Oh yes, the stepper motor 😉  )  check your GND lines for a clean gnd line to the PC !!

EDIT ... too late 🙂

[nyc_(is_out_of_here)]

Also, a co-worker had another USB-serial cable with FTDI chipset. Needless to say this cable also worked fine.