# How to Wire a Stepper Motor Brake (Back to Wall Mounting)

**URL:** <https://forum.onefinitycnc.com/t/how-to-wire-a-stepper-motor-brake-back-to-wall-mounting/23069>\
**Category:** Uncategorized\
**Created:** [October 30, 2023, 6:14am UTC](https://forum.onefinitycnc.com/t/how-to-wire-a-stepper-motor-brake-back-to-wall-mounting/23069 "2023-10-30T06:14:41Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [October 30, 2023, 11:29pm UTC](https://forum.onefinitycnc.com/t/how-to-wire-a-stepper-motor-brake-back-to-wall-mounting/23069/5 "2023-10-30T23:29:36Z")

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Hey Justin,

sorry that today I could not find the time to continue the post above ☹

> [@SundownWoodworks](#):
>
> I hate that I’m a dunce at electronics, but I’d much rather be spending my evenings designing pieces to carve rather than trying to learn enough electronics to design simple systems safely.

I would agree to this. I am an electronics person as well as a woodworking person, so I can achieve the electronics solutions that are needed for this purpose.

> [@SundownWoodworks](#):
>
> Could I not set a relay to pin 15 of the breakout board ( is that the I/O you mention?), which would shut power to the 24V power supply of the brake, rather than shutting power to a router? I’ll be running a spindle, so pin 15 is available.

pin 15 is the ‘tool-enable’ pin, that is activated with the ‘tool-enable-mode’ setting on the TOOL page, which means, pin 15 is triggered through the g-code command “[M3 (start spindle)](https://linuxcnc.org/docs/html/gcode/m-code.html)” and “M5 (stop spinde)”, and also when ‘estopped’ mode is entered (but not when big red button on the Onefinity Controller box is hit! Connect a big red button to pin 23 and ground on the 25-pin I/O port to make a big red button use of activating the ‘estopped’ mode).

The ‘tool-enable’ functionality is out of use when the ‘tool-type’ on the TOOL page is set to one of the VFDs for driving a spindle, since then the buildbotics-derived Onefinity Controller supports Modbus over a RS-485 serial communications line (unlike Elite Series/Masso G3 who do not) and controls the VFD over the serial ModBus port. But unortunately pin 15 ‘tool-enable’ cannot be assigned to be used to something else.

However the possible solutions for wiring the motor brake are not that complicated.

But unfortunately I can’t write more at the moment, got to leave again!

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