How does ITCM determine the System Type in the agent inventory?

Document ID : KB000016904
Last Modified Date : 02/03/2018
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Question:

How does ITCM determine the System Type in the agent inventory?

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Environment:
Client Automation (ITCM) -- All versions
Answer:

The system type is determined by a field read from the system bios, known as the system enclosure type or chassis type.  Reference MSDN article: https://msdn.microsoft.com/en-us/library/aa394474(v=vs.85).aspx

The following vbs script can be run to read the same value via a WMI call:

--------------------------- 
strComputer = "." 
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\CIMV2") 
Set colItems = objWMIService.ExecQuery( _ 
"SELECT * FROM Win32_SystemEnclosure",,48) 
For Each objItem in colItems 
Wscript.Echo "-----------------------------------" 
Wscript.Echo "Win32_SystemEnclosure instance" 
Wscript.Echo "-----------------------------------" 
If isNull(objItem.ChassisTypes) Then 
Wscript.Echo "ChassisTypes: " 
Else 
Wscript.Echo "ChassisTypes: " & Join(objItem.ChassisTypes, ",") 
End If 
Next 

---------------------------

The return value of the script can be aligned with the ChasisType values listed in the MSDN article:

Other (1)
Unknown (2)
Desktop (3)
Low Profile Desktop (4)
Pizza Box (5)
Mini Tower (6)
Tower (7)
Portable (8)
Laptop (9)
Notebook (10)
Hand Held (11)
Docking Station (12)
All in One (13)
Sub Notebook (14)
Space-Saving (15)
Lunch Box (16)
Main System Chassis (17)
Expansion Chassis (18)
SubChassis (19)
Bus Expansion Chassis (20)
Peripheral Chassis (21)
Storage Chassis (22)
Rack Mount Chassis (23)
Sealed-Case PC (24)