Originally Posted by
ger21
Gary is incorrect. You supply 5V to the VCC pin, and the ground from the 5V supply needs to go to the first pin labeled Gnd, where you have labeled 2. This is required to power the board. The top right of the data sheet says that:
A single 9 pin Molex header contains all of the logic signals
necessary to operate the drive
1) GND Logic Power Return (Ground)
2) SLEEP# Shuts down entire drive
3) MS1 Sets up microstepping mode.
See Table Below Left
4) MS0 Sets up microstepping mode.
See Table Below Left
5) HOME# Motor Position Indicator
6) ENA# Disables Motor drives.
7) DIR Motor Direction Signal
8) STEP Motor Step signal
9) VCC Logic Power Supply (+5V)
The MS0 & MS1 inputs may also be selected via onboard
umpers. The ENA# input may also be enabled via an onboard
umper. The minimum connections would be GND, STEP,
DIR, and VCC. See schematic (last page) for actual
onnection assignment.
Also:
Logic Requires < 50 mA at +5.0V on the 9 pin Molex connector