Your code will look something like this:
if (!(Get-PSSnapin | where {$_.Name -eq "SwisSnapin"})) {Add-PSSnapin "SwisSnapin"}$server=<IP or FQDN of your Solarwinds server>$credential = Get-Credential$SWIS= Connect-Swis -Credential $credential -Hostname $server$IP = <IP of the node you want to change>$swisQuery = "SELECT URI from Orion.Nodes where IP = \@p"$targetNodeURI = Get-SwisData $SWIS $swisQuery @{p=$IP}$targetNodeProps["IP"]=$IP$targetNodeProps["SNMPVersion"]=<Your node's SNMP version>$targetNodeProps["Community"]=<Your node's SNMP read community string>$targetNodeProps["ObjectSubtype"]="SNMP"Set-SwisObject $SWIS -Uri "$targetNodeURI" -Properties $targetNodeProps