How to Check PUL/DIR Ports with Only a Power Supply and Motor?

In this video, we demonstrate how to quickly test whether the PUL/DIR ports of a stepper driver are functioning properly using only a switching power supply, one stepper driver, and one stepper motor.

🔹 Simulate pulse signals by intermittently touching wires, allowing the motor to rotate one step at a time

🔹 Change the motor rotation direction by applying voltage across the DIR+ and DIR− terminals

🔹 Ideal for troubleshooting when no motion controller or PLC is available

This is a simple, direct, and effective method for diagnosing stepper driver port issues, especially useful for beginners, technicians, and field troubleshooting scenarios.

If you need a quick way to verify whether your stepper driver input ports are working properly, this video will help.

Updated on: 29/05/2026