CP2105-EK
Rev. 0.5
3
5. CP2105 Software Interface
If the Virtual COM Port drivers are used, the CP2105 will appear as two COM ports in the Device Manager, as
shown in Figure 2. The CP2105 will always use the lowest available COM ports for operation. For instance, if COM
ports 1 and 2 are in use by other peripherals and applications, the CP2105 will use COM 3 and COM 4.
The CP2105 functions identically to two COM ports from the reference point of both the host application and the
serial devices, and it can support serial device control requests defined in the Microsoft Win32
®
Communications
API. Examples for how to communicate with the device as two serial COM ports are included in AN197 on the
www.silabs.com/interface-appnotes
page or in the SDK.
If the USBXpress drivers are used, the CP2105 will appear as two USB USBXpress devices as shown in Figure 2.
Examples for how to communicate with the device using the USBXpress interface are included in AN169 on the
www.silabs.com/interface-appnotes
page.
Figure 2.
CP2105 in Device Manager