7i92 cnc motion controller from aliexpress?

Can you not message the vendor for any documents ?
Unless someone else has one and is willing to share their experiences, you're venturing into unknown territory.

If it does run 7i92 firmware any threads relating to 7i92 setup should suffice.

One thing to look out for in Mesa's design of the 7i92 fet bus switches were used for translation between 3.3 to 5v. I think I can recall PCW saying that they were never intended to drive any loads directly but through at the least a buffer or more likely through a breakout board.
Another thing is, if the vendor has changed any pin assignments and have not provided a ucf file the only way to find out pin assignments would be via JTAG, the easier method of via direct probing of pins, which isn't a lot of fun with the pin spacing of the FPGA. Not knowing the in assignments would make modifying the firmware somewhat difficult at best.

So there could be some gotchas for new players.

Reyes wrote:

Any one using this card?

I bought similar but not the same. Most important is that, there is custom bitfile preloaded at factory. If your's card works, do not try load any other bitfile.
I have some files received from seller (in attachment), the mesa-rtcp config is works for me, but not all resources are configured.
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They should provide the firmware source files as well. Especially the ucf file if it's required you need to modify the firmware. Or otherwise you'll need to perform a boundary scan to work out what FPGA pin does what. One can not be sure if they have followed the same same pin assignments as the Meas schematics. These could change for simpler PCB routing.

I have communicated with the seller, and they replied that the board comes with a pre-installed custom firmware. There is no need to flash the firmware. Once you receive the board, you can simply use PNCconf, enable the advanced options, and directly read the board’s I/O for configuration

Even if that is the case, the firmware sources should be supplied, if in fact the firmware is built from Mesa's sources.
There is also the thing about portraying as a 7i92, which in fact it is not.
I have a feeling that some of these boards are being built from the reverse engineering YouTube user talla83 has done.
However it happens what it comes down to is, do you want a product from a well established company with a well established support network, or some entity that is using some else's IP and with no established history of support, and in fact the original company, Mesa, is supplying the real support.

I've been trying to avoid these useless headbutting exercises, but I feel like some things really need mentioning.
What is also a little ironic is that Mesa will supply schematics when asked, yet I wonder how many of these manufacturers would extend the same courtesy ?