I have a number of Digi SP 1 and started configuring them as TCP socket communications on Port 2101. That part is working great. We have a legacy app that we did not write that uses comm ports only so I configured the RealPort driver in my XP machine and changed the SP to the RealPort setting. That works fine, but I would like to use my own app to talk direclty to the SP without using the virutal port. I tried using the portion of my app on port 771, and I see TX traffic out of the SP, bit it doesn't work. How can I make my App look like a RealPort host?