Originally Posted by
109jb
I'm not trying to get into a pissing match about this. I'm just trying to help the OP to not chase ghosts. He can easily see if the drive is enabled by powering up and trying to rotate the stepper. If enabled it will be difficult to rotate and when disabled will rotate easily.
If the pin does need +5V to enable the drive, for testing, I would recommend just jumpering +5V to the pin rather than going through all the setup, assigning pins in software, etc. That can be done later if desired.
As for leaving the pin floating, the drive manufacturers actually say this is OK in the manuals. For example the Leadshine DM542 manual states:
"Enable signal: This signal is used for enabling/disabling the driver. High level (NPN control
signal, PNP and differential control signals are on the contrary, namely low level for enabling.)
for enabling the driver and low level for disabling the driver. Usually left UNCONNECTED
(ENABLED). "