slaved stepper problems

[Gary]

actually just came in from doing it. the driver obviously has problems. they are 452 drivers, all of them. any ideas what could be wrong with it.

If the voltage going to the direction is only 2.99V, it is unlikely a problemn with the driver but the signal is too low for the opto to change.
What are you using to power the 5V on the breakout board?
If you are using USB, dont and get yourself a 5V power supply.

[Jonathan]

If the voltage going to the direction is only 2.99V, it is unlikely a problemn with the driver but the signal is too low for the opto to change.

3V is borderline, more susceptible to interference, (driver manual says minimum 7mA, 2.99V gets about 4-5mA) yes, but as the same signal works with the other drivers it's less likely to be that. Still it's worth just applying 5V and 0V to the direction pin from a power supply, or directly from the USB +5V to check.