Grass Valley Kayenne XL Package Installation v.7.0.4 - Manual (Page 148)

148 Kayenne XL Package — Installation and Service Manual
Section 5 — Maintenance
Figure 124. Port Properties
The default port settings as shown above are expected by the SP serial inter-
face.
Now set the Sidepanel registry entry to the right port number (in our
example it was COM 3).
Start regedit.
Figure 125. Start Regedit
Enter the following registry path:
HKEY_CURRENT_USER/Software/BTS/SP/Serial
and enter a new DWORD value SerialPort as shown below. 
In this example '3' --> means COM3.