> 3.2 | Installing the WinMux Driver

> Before starting the installation make sure that all files are located in the same folder as the wmuxinst.exe:

> • | winmux2k.inf

> • | winmux2k.sys

> • | wmuxprop.dll

> 1. | Start the program wmuxinst.exe. The WinMux Driver Setup dialog opens.

> 2. | Ensure that the module is connected to a serial port, and turn the module power on.

> 3. | In the WinMux Driver Setup dialog, press the Start Scan button. All Siemens modules found will be listed along with the physical COM port they are connected to. Also, the next free virtual COM ports on the Windows computer will be indicated. If at least one modem is found, the Install Driver button becomes active. Select the module to be configured for Multiplex mode and press Install Driver.

> 4. | Use the Device Manager to check that the installation was successful.

> The virtual ports are available without reboot. The driver instances are visible in the device manager class “Multi-port Serial Adapters”. If you wish to uninstall the driver see Section 3.3.
> Although it is not recommended, it is possible to modify the driver’s factory defaults by editing, prior to the driver installation, the parameters contained in the winmux2k.inf file. This approach can be used, for example, if you want to use another default baud rate or if you want to replace the string AT+CFUN=0 with one of the CYCLIC SLEEP mode settings supported by your module, such as AT+CFUN=5 or 6 or 7 or 8 or 9. See also Section 4.2.
> Note: During the installation a warning message may appear saying that the software has not passed Windows Logo testing. Please ignore this message and continue the installation process. The reason for the message is that the driver has not been registered with Microsoft, but its correct functionality is ensured.