Centroid Community CNC Support Forum

Hello Everyone,

We are trying to figure out the where the ZRI+ pin 9 and ZRI- pin 1 on DMM DYN4 DB9 cable
goes to when connecting to the ENC1 DB9 cable connection on the Acorn6 Board.

Acorn6 Board layout showing the DB9 Connectors:

https://www.centroidcnc.com/dealersuppo ... 164.r1.pdf

Also what is this ZRI line used for as the Acorn only has one ZRI Input available and we have
6 AC Servo drives to hook up.

Also on both the DB9 connections there are Z+ and Z-, what are these used for?

Best Regards,

Preston

you can use one input for all the zri's , cnc12 will look at that input when homing (if programmed to do so) , it moves one axis at a time for homing so it 'knows' which axis zri tripped even though they are all using the same input.

ZRI+ and ZRI- do not go to the DB9 encoder connections on the Acorn. If you look closely at the diagram you posted it shows the connections. ZRI- goes to the Acorn COM and ZRI+ goes to any of the available input and then you have to program that input in the Wizard to ZRIHomingAll for it to work properly. As Keith stated you can wire all three axis ZRI outputs to a single input and the ZRI homing macro will know what to do.

would be great for you to have a build thread with all info in one thread rather than scattered info.
viewtopic.php?t=11789

here is how.
viewtopic.php?f=60&t=6928

Creating a "build thread" on centroidcncforum.com offers several advantages for a customer, particularly those working on CNC projects with Centroid products like the Acorn, AcornSix, USB-BOB,Hickory, Oak, or Allin1DC controllers. Based on the forum’s structure and guidance, here’s why it’s beneficial:
Organized Documentation: A build thread consolidates all information, questions, and progress about your CNC machine project into a single, cohesive post. Instead of scattering details across multiple threads or emails, everything—from initial setup to troubleshooting—is in one place. This makes it easier for you and us to track your progress and refer back to earlier steps or solutions.

Timely CNC Technical Assistance: The forum’s posting guidelines highlight that a build thread is "an effective way to receive timely technical support." By keeping everything centralized, experts like moderators or other power users can quickly spot where you’re at and offer targeted solutions, especially since Centroid staff actively monitor the forum.

Resource Centralization: The forum encourages linking to a single photo album, YouTube channel, or Google Drive folder within your thread. This keeps all visuals and files in one spot, making it easier for you to manage resources and for others to follow along without sifting through attachments spread across multiple posts.

Showcasing and Learning: A build thread lets you document your journey start-to-finish, which can be satisfying and educational. You can share successes (like completed retrofits, featured in the "Success Stories" section) and learn from feedback. It also inspires others while allowing you to refine your approach based on community input.

Better Support from the CNC Community: The forum emphasizes that a build thread helps others understand your project comprehensively. When you need help, responders (including Centroid staff and experienced users) can see the full context—photos, specs, and prior issues—without you having to repeat yourself. This leads to faster, more accurate advice, as the community doesn’t have to dig through disjointed posts to piece together your situation.

In short, a build thread streamlines communication, enhances support quality, and creates a valuable record—saving you time and frustration while maximizing the forum’s collaborative potential.