<p>The <a href="http://www.sainsmart.com/sainsmart-mechanical-endstop-for-cnc-3d-printer-reprap-makerbot-prusa-mendel-ramps.html" rel="nofollow">website</a> shows exactly what each wire is for.  Both middle wires are ground, the wire on the same side as the lever is the signal wire and the last wire is the power wire.</p>

CC BY-SA 3.0
2016-01-17T05:24:51.377Z
Okay I didn't buy it off if their website and so I was unaware of the documentation.  Thank you!
leeand00
CC BY-SA 3.0
2016-01-17T02:30:02.617Z
2016-01-17T02:30:02.617Z
tjb1
<p><a href="https://i.sstatic.net/CJArK.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/CJArK.jpg" alt="enter image description here"></a></p>

<p>The Sainsmart Endstops I picked up are different from the ones described in the RepRap Prusa i3 Rework electronics assembly wiki;  they have 4 female plugs that go into the RAMPS 1.4 board instead of 3:</p>

<p><a href="https://i.sstatic.net/iVXzh.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/iVXzh.jpg" alt="enter image description here"></a></p>

<p>Since these endstops are different, how do I hook them up,  and what do the markings on them mean?</p>

<prusa-i3-rework>
My endstops have 4 female plugs, but the examples on the RepRap Prusa i3 Site have 3; what are each of them for?
leeand00
# My endstops have 4 female plugs, but the examples on the RepRap Prusa i3 Site have 3; what are each of them for?

(Asked by: username_0 on 2016-01-17)

[![enter image description here](https://i.sstatic.net/CJArK.jpg)](https://i.sstatic.net/CJArK.jpg)

The Sainsmart Endstops I picked up are different from the ones described in the RepRap Prusa i3 Rework electronics assembly wiki; they have 4 female plugs that go into the RAMPS 1.4 board instead of 3:

[![enter image description here](https://i.sstatic.net/iVXzh.jpg)](https://i.sstatic.net/iVXzh.jpg)

Since these endstops are different, how do I hook them up, and what do the markings on them mean?

**Tags:** prusa-i3-rework

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## 1 answers

### Answer by username_1 on 2016-01-17. Score: 3 | Accepted answer

The [website](http://www.sainsmart.com/sainsmart-mechanical-endstop-for-cnc-3d-printer-reprap-makerbot-prusa-mendel-ramps.html) shows exactly what each wire is for. Both middle wires are ground, the wire on the same side as the lever is the signal wire and the last wire is the power wire.

> **Comments:**
> **username_0**: Okay I didn't buy it off if their website and so I was unaware of the documentation.  Thank you!  

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