viski wrote: Can i use 5i25 to communicate with 7i90hd ? I have it .
In principle, yes.
The 7i90 can operate as a smart-serial daughter card. So if your 5i25 was flashed with a smart-serial controller firmware, and the 7i90 was flashed with a smart-serial remote firmware, and the electrical interface was correct, it would work.
If, for example, you had a 5i25 + 7i76 then the 7i90 could connect directly to the smart-serial expansion connector, and the firmware and electrical interface would be correct all the way to the 7i90. Then you would just need the correct firmware flashed to the 7i90.
But, I think this is something of a chicken-and-egg problem at that stage.
You _can't_ use the 5i25 to communicate via EPP, the connector is the same, but nothing else is.
