List of SerialPorts queried using WMI differs from devicemanager?

Question

I have the following serial ports listed in my devicemanager:

• COM3
• COM4 (BT)
• COM5 (BT)
• COM6 (GlobeTrotter MO67xx - Control Interface)
• COM7 (GlobeTrotter MO67xx - GPS Control Interface)
• COM8 (GlobeTrotter MO67xx - GPS Data Interface)
• COM9 (GlobeTrotter MO67xx - Diagnostics Interface)
• COM11 (USB Serial Port)
• COM12 (USB Serial Port)
• COM45 (SUNIX COM Port)
• COM46 (SUNIX COM Port)

The SUNIX COM ports are connected via an internal PCI-Card. The USB Serial Port is connected via USB (FDTI-chip) The GlobeTrotter ports are from a GlobeTrotter device connected via USB. There are also a modem, a USB-device and a network device listed for this modem.

So I have several different sources of serial ports.

All I want to do is to get a list containing all those ports using WMI.

For my tests I am using WMI Code Creator

Test 1:

root\CIMV2; Query: SELECT * FROM Win32_SerialPort only returns the following serial ports:

• COM3
• COM4
• COM5

Test 2:

root\WMI; Query: SELECT * FROM MSSerial_PortName only returns the following serial ports:

• COM3
• COM11
• COM12
• COM45
• COM45

How can I get a complete list of serial ports?

Answer 1

I found the solution.

The following query (root\CIMV2) gets the requested results:

SELECT * FROM Win32_PnPEntity WHERE ClassGuid="{4d36e978-e325-11ce-bfc1-08002be10318}"

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Update

This answer is pretty old now. Ehen I asked it I still had to consider WinXP and was using Windows7. Since I don't deal with serial ports any more, I can't give any new information on that issue. At that time this solution reported all ports that the devicemanager was showing. But I know listing serial ports is not that easy so this answer might not be correct in all scenarios.