Problem connecting telescope to Pro 7


    I have an Orion telescope with a Sirius EQ-G mount.  I'm trying to connect to StarryNight Pro 7.  As directed in the online help, I configured as a Celestron (I just installed latest ASCOM drivers for Celestron, as well).  When I attempt to connect, I get error that "no Celestron telescope detected".   Windows thinks my USB to serial adapter is working (as COM3).  Do you have any suggestions to solve or further troubleshoot this issue?  Thanks much.