Palm m500 - Manual (Page 193)

Chapter 7 Page 183
5. In the Serial Port drop-down box, select the simulated port that
your computer uses for infrared communication.
Note: See the documentation for your operating system for
instructions on finding the simulated port. This
information is usually located in the Control Panel.
6. Click OK.
Note: If your cradle is connected to a USB port, you can
continue using it while HotSync Manager is configured
for infrared communication. If your cradle is connected to
a serial port, you cannot use your HotSync cradle again
until you reconfigure the HotSync Manager to
communicate with the port defined for cradle
synchronization.
To configure HotSync Manager for infrared communication
on a Macintosh:
1. Double-click the HotSync Manager icon in the Palm folder.
2. In the HotSync Controls tab, select Enabled.
3. Click the Serial Port Settings tab.
4. Under Check for handheld connection using, select Local Setup.