# Expansion Pins - Avid breakout board

**URL:** <https://forum.avidcnc.com/t/expansion-pins-avid-breakout-board/1260>\
**Category:** General Chat\
**Created:** [November 11, 2022, 2:03am UTC](https://forum.avidcnc.com/t/expansion-pins-avid-breakout-board/1260 "2022-11-11T02:03:06Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Niendorff](https://avatars.discourse-cdn.com/v4/letter/n/fbc32d/32.png) [@Niendorff](https://forum.avidcnc.com/u/Niendorff)\
**Post date:** [November 11, 2022, 2:03am UTC](https://forum.avidcnc.com/t/expansion-pins-avid-breakout-board/1260/1 "2022-11-11T02:03:06Z")

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Hi all,

Quick question. I am working on adding an additional input to my 5x5 Pro CNC router. The Avid ESS breakout board has a full strip of additional input point (15 or 16 I think), which the avid docs reference as NPN inputs for expansion. (And they don’t say much more about them). I have not had any success locating these inputs in the Avid, ESS, or Mach 4 configurations. Maybe I overlooked it? Google also seems clueless about it, so here I am asking ……. Does anyone know where these inputs map to?

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**Author:** ![jjneeb](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/jjneeb/32/244_2.png) [@jjneeb](https://forum.avidcnc.com/u/jjneeb)\
**Post date:** [November 11, 2022, 3:10am UTC](https://forum.avidcnc.com/t/expansion-pins-avid-breakout-board/1260/2 "2022-11-11T03:10:50Z")

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Have you seen this? [Schematics - CNC Controller Technical Manual](https://www.avidcnc.com/support/instructions/electronics/pnp/manual/20.1/schematics/)

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**Author:** ![Niendorff](https://avatars.discourse-cdn.com/v4/letter/n/fbc32d/32.png) [@Niendorff](https://forum.avidcnc.com/u/Niendorff)\
**Post date:** [November 11, 2022, 3:59am UTC](https://forum.avidcnc.com/t/expansion-pins-avid-breakout-board/1260/3 "2022-11-11T03:59:06Z")

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That just what I needed. Thanks a bunch. Don’t know how I missed it.

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**Author:** ![jjneeb](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/jjneeb/32/244_2.png) [@jjneeb](https://forum.avidcnc.com/u/jjneeb)\
**Post date:** [November 11, 2022, 4:23am UTC](https://forum.avidcnc.com/t/expansion-pins-avid-breakout-board/1260/4 "2022-11-11T04:23:24Z")

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You can also pick off the port 3 pins from the top of the ESS, there are a lot of unused ones there.

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**Author:** ![TwigStudio](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/twigstudio/32/3152_2.png) [@TwigStudio](https://forum.avidcnc.com/u/TwigStudio)\
**Post date:** [October 6, 2024, 4:27pm UTC](https://forum.avidcnc.com/t/expansion-pins-avid-breakout-board/1260/5 "2024-10-06T16:27:52Z")

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Hello! In that schematic, there are terminals labeled “Future Input Signals” and another set labelled “Replicated Outputs”. I am trying to hook up the RapidChange and need to make an input for the IR sensor and an output for the cover. Am I looking in the right place? Can the IR sensor just hook up to one of the Future Input Signals? What about the output? I can’t tell from the schematic.

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**Author:** ![TwigStudio](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/twigstudio/32/3152_2.png) [@TwigStudio](https://forum.avidcnc.com/u/TwigStudio)\
**Post date:** [October 6, 2024, 9:36pm UTC](https://forum.avidcnc.com/t/expansion-pins-avid-breakout-board/1260/6 "2024-10-06T21:36:23Z")

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I got the info. If anyone else has this question let me know and I’ll send you what I have…