Verified Effective Samples

Attempt1.ps1

function Get-CorpSysInfo
{
    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline, ValueFromPipelineByPropertyName)]
        [ValidateNotNullOrEmpty()]
        [string[]] $ComputerName = $env:COMPUTERNAME,

        [ValidateSet('Dcom', 'Wsman')]
        [string] $Protocol = 'Wsman'
    )

    begin
    {
        $option = New-CimSessionOption -Protocol $Protocol
    }

    process
    {
        foreach ($computer in $ComputerName)
        {
            $session = $null

            try
            {
                $session         = New-CimSession -ComputerName $computer -SessionOption $option -ErrorAction Stop
                $operatingSystem = Get-CimInstance -CimSession $session -ClassName Win32_OperatingSystem -ErrorAction Stop
                $bios            = Get-CimInstance -CimSession $session -ClassName Win32_BIOS -ErrorAction Stop

                [pscustomobject] @{
                    BIOSSerial   = $bios.SerialNumber
                    ComputerName = $operatingSystem.CSName
                    SPVersion    = $operatingSystem.ServicePackMajorVersion
                    OSVersion    = $operatingSystem.Version
                }
            }
            catch
            {
                Write-Error -ErrorRecord $_
                continue
            }
            finally
            {
                if ($session) { Remove-CimSession -CimSession $session }
            }
        }
    }
}

Attempt2.ps1

function Get-CorpSysInfo
{
    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline, ValueFromPipelineByPropertyName)]
        [ValidateNotNullOrEmpty()]
        [string[]] $ComputerName = $env:COMPUTERNAME,

        [ValidateSet('Dcom', 'Wsman')]
        [string] $Protocol = 'Wsman'
    )

    begin
    {
        $option = New-CimSessionOption -Protocol $Protocol
    }

    process
    {
        foreach ($computer in $ComputerName)
        {
            Write-Verbose "Attempting connection to $computer over $Protocol"

            $session = $null
            try
            {
                $session = New-CimSession -ComputerName $computer -SessionOption $option

                if ($null -eq $session)
                {
                    Write-Warning "Failed establishing $Protocol session to $computer"
                    continue
                }

                $operatingSystem = Get-CimInstance -CimSession $session -ClassName Win32_OperatingSystem
                $bios            = Get-CimInstance -CimSession $session -ClassName Win32_BIOS

                [pscustomobject] @{
                    BIOSSerial   = $bios.SerialNumber
                    ComputerName = $operatingSystem.CSName
                    SPVersion    = $operatingSystem.ServicePackMajorVersion
                    OSVersion    = $operatingSystem.Version
                }
            }
            finally
            {
                if ($session) { Remove-CimSession -CimSession $session }
            }
        }
    }
}