When you install drivers for a new USB device, Windows may assign it a high COM port number. To change it to a lower number, follow these steps:
Open Device Manager (for example, click Start, select Run, and enter devmgmt.msc). Open Device Manager.
Right-click the device whose COM port number you want to change and select Properties. In this example, the OPTO-GAZ interface will be reassigned from COM5 to COM2. Open the properties of the OPTO-GAZ interface.
Open the Port Settings tab and click Advanced. Open the COM Port Number list in Advanced Settings.
Select the desired number from the COM Port Number drop-down list. Choose an available port, avoiding those marked “in use”. In this example, COM2 is available and will be assigned to the OPTO-GAZ interface. Select the available COM2 port.
Click OK to confirm the change. COM5 will become available for another device, and COM2 will be assigned to the OPTO-GAZ interface. Confirm the change from COM5 to COM2.
Original guide by Radosław Podgórski. English translation and editorial adaptation.
Source: Podmienianie portów COM na podstawie Windows 7 . Illustrations are English-localized versions of the original screenshots.
Installing the CMB-03 GSM/GPRS telemetry module driver
This guide illustrates installation in Windows 7. The original driver package is intended for Windows 98, ME, XP, Vista and 7. Installation screens and requirements may differ in other Windows versions.
1. Download and extract the drivers
Download the appropriate CMB-03 driver ZIP archive from COMMON and extract it to a folder of your choice. Windows XP and later include built-in ZIP extraction. If necessary, use an archive utility such as 7-Zip, WinRAR or WinZip.
2. Connect the telemetry module
Connect the module to a USB port. Windows will display a notification indicating that it is attempting to install the device driver automatically.
In the example shown, automatic installation fails because Windows cannot find a suitable driver.
3. Open Device Manager
Press Windows + R, enter devmgmt.msc, and press Enter. Alternatively, right-click Computer, select Manage, and open System Tools → Device Manager.
Use an account with local administrator privileges to install the drivers.
4. Install the USB converter driver
Under Other devices, right-click Moduł Telemetryczny CMB-03 and select Update Driver Software…. This device name is supplied by the device or driver and may remain in Polish on an English installation of Windows.
Select Browse my computer for driver software and specify the folder containing the extracted drivers. Follow the installation wizard.
5. Confirm the driver publisher warning
The older driver shown in this guide is not digitally signed. Windows therefore displays a publisher verification warning. If you are installing the correct driver obtained from COMMON, select Install this driver software anyway.
6. Complete the converter installation
Windows will confirm that the driver for USB <-> CMB-03 Converter has been installed successfully. Click Close.
7. Check the devices in Device Manager
Under Universal Serial Bus controllers, confirm that USB <-> CMB-03 Converter is listed. A second device, USB Serial Port, should appear under Other devices.
8. Install the serial port driver
Right-click USB Serial Port and repeat the manual driver installation using the same extracted driver folder. The publisher verification warning may appear again.
Windows will then confirm successful installation of CMB-03 Service Port.
9. Check the assigned COM port
Expand Ports (COM & LPT) in Device Manager. Confirm that CMB-03 Service Port is listed and note its assigned COM port number. In this example, it is COM6; your computer may assign a different number.
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