Articles on: Learning & FAQ

Introduction and Wiring of Stepper Driver ALM and BRK Ports

In addition to the signal input ports that control motor operation (PUL), direction (DIR), and start and stop (ENA), the signal ports on the stepper driver also have signal output ports: ALM and BRK.

If you just want to simply control the operation of the stepper motor, then ALM and BRK do not need to be connected. They are only used to output signals and are not used to control the motor. Here is some explanation of these two ports:


ALM is the alarm signal output port. When used, it needs to be connected to the signal receiving end of the driver. There are two wiring methods for the ALM port, as shown below:

When the driver triggers an alarm, the internal switch between ALM+ and ALM- is closed and an alarm signal is output to the controller.


BRK is the brake signal output port. When using it, you need to connect the relay and the brake of the motor. The wiring method is as follows:

When the driver outputs the braking signal, the relay is disconnected, the motor is braked and stops running.
When using the drive's BRK port to control the brake for braking, the reaction speed is faster than when the motor's brake is powered alone.

Updated on: 11/12/2023

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