User's Manual

Introduction
V1.5 BlueTree Wireless M2M Express Product Manual 13
For example, HotSync - software used for communicating with the
PalmPilot can occupy the COM port even if the PC does not have
PalmPilot connected to that COM port.
Check any software that loads when your computer starts up, any
software that appears as an icon on your Windows task bar, and disable
or close any applications that normally use a COM port.
Is another modem installed on the PC? Older internal modems can
cause COM port conflicts. PC Card (PCMCIA) modems in laptops can
switch the COM port number of your built-in COM port.