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No additional hardware is needed, you simply make sure the 7I85S
is jumpered for differential mode (this is the as-shipped default)

The amount of AI content on YouTube is getting to be painful, and it's quite obvious those that put it out don't bother reviewing it......how many times do you need to hear the same phrases.

Hallo zusammen,

leider bin ich mir trotz vielem Lesen noch immer nicht sicher, wie Glasmaßstäbe mit EIA-422-Schnittstelle korrekt an Mesa-Karten (z.B. 7i85 oder 7i85S) angeschlossen werden können - wird hier ein Signalkonverter benötigt?
Wenn ja, wäre hierzu der "422ENC One channel RS-422 to TTL adapter" von Mesa geeignet?


Danke,
Gerhard

Just getting started on planning my AXYZ cnc router retrofit. Regarding the “AXYZ AXI” stepper drivers, the wiring diagram I have indicates driver control is standard 3 cable (12vdc, step, dir). Dip switches have the micro steps set to 1200 micro steps/rev (default). Is there anything else I need to know?

The stock spindle inverter was replaced with an eTrac X2C and is currently wired with 6 wires (gnd, decelerate, accelerate,  5vdc, feedback, on/off). Is there anything else I should consider?

My current plan is to purchase a Mesa 7i96s. For a pc, I have a Dell Optiplex 7050 and an ELO touchscreen ready to go.

Backstory, the AMC controller board on the small AXYZ cnc router that I bought is bad. It shows ‘Error 92’ or no controller OS and the AXYZ tool path software is unable to communicate with the board to restore it. My plan had been to convert the machine to Linuxcnc anyways but it would have been nice to test it and take some measurements prior to starting the conversion.

If you are using the 7I96S, and its encoder interface is free,
you can setup homing to index, using encoder feedback.

If you do not want to use encoder feedback, you can use
7i96s_esdid1.bin firmware that supports homing  to index on
step/dir channel 0. Note that you don't need a full
encoder for this as only the index signal is used.

It either case, I would assume you have the encoder with index
on the motor and the home switch on the A axis.

I would like to get started on a LinuxCNC based three axis machine and keep the costs low.  Based on reading extensively on the web, I have decided to try with a RPI5 as the host and some flavor Remora.  The Remora part has me totally uncertain.  I going for simple.  I have read the Remora pages and it seems like SPI is a good bet.  The question is what HW for the Remora.  So multiple Bigtreetech "SKR" boards are listed as tested but the ones I see for sale are often listed as "mini" (does that make a difference) ??? and more concerning, list GD prefix main processors, not the STM  processors that are listed as tested in the Remora pages.  Are any of the Bigtreetech SKR boards with GD prefix processors known to work with Remora?  I would really appreciate some help in figuring out which low cost HW to buy that gives me a good chance of it working and not requiring low level hacking.  TIA.

Its probably repairable. If it was an output short, its likely just a damaged
MOSFET ( NDT3055 ) A 7I37TA will work as a replacement, but you need to
change the wiring as Andy mentioned.

Here's the BOM: