"Really far" is not a valid distance measurement. 25km is "Really far" for me to walk to go plug in my laptop. It is not "Really far" for an unobstructed microwave link.
Download Google earth. Find the coordinates of both ends of the link and post them here. I'll check the path.
You still have not provided ANY information about your DCS or SCADA system and you are starting to waste everyone's time now.
Until you provide some detail, the answer to your question is:
Yes, you might need to deploy extra hardware and/or software at the DCS side. But you also might not.