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I've been looking into RIO for couple of days, reading forums and one question i can't find the answer for, may be it is obvious for all but me, what is the data protocol used in RIO over the spi? is it the same as Mesa LBP16 commands requiring hostmot2 or something else?

I'm sorry.
It seems it was my misunderstanding.

I've had a problem for a few runs where my X axis has been stalling while traveling to the right, and today it completely stopped working entirely. I've traced the problem all the way back to the mesa board.

By plugging in the X axis control lines in Y or Z's control ports on the board, it functions as expected. That means its not the wiring, the drivers, not the stepper itself, but something on the Mesa itself.

I've not changed anything in the INI besides some homing offsets for quite some time and it functioned perfectly for a around 6 months prior. There has been some temperature increases, but the mesa is in cased with 2 120mm fans facing it.

Has anyone seen or had this problem before? Is there a solution you can suggest?

You would probable need a daughtercard because
the XY100 interface needs 4 differential outputs and
1 differential input (that is you could not directly connect
to P1). Something like a 7I78 could do.

Without buying anything, you could test the galvanometer
with a 7I95T config that steals 2 step/dir channels to get the
XY100's 4 differential outputs and use a sserial input for the
differential input.
 

Hello! New to LinuxCNC and Mesa and trying to set up a 6-axis (+2 galvo axes) laser system. All 6 of the step/dir and encoder pins of the 7i95T are anticipated to be used, and trying to figure out how other pins can be repurposed.

Is there a firmware version for the 7i95T with xy2-100 support (xy2mod)? The unit currently has the default 7i95t_d.bin firmware loaded.

Which pins on the 7i95T could be used for controlling a 2-axis galvanometer? Would the Serial 0 and Serial 1 pins be suitable?

The manual mentions that the P1 expansion port can be used to expand I/O including for more step/direction channels. Can these pins be redefined for such purposes directly or is an expansion card / daughterboard needed?

Can (which?) pins on the 7i95T be used to control an IPG laser (please see attached image of pinouts from laser specifications) or is another card needed?