USB to Serial Redirection on WS2012 RDS

Hello! 

I have Windows Server 2012 with RDS enabled and 2 thin clients. Each thin client has USB barcode scanner connected. Scanners are successfully redirected and identified by USB-to-serial driver, so that two similar COM-port devices (f.e. COM9 and COM10) can be found in device manager on the server.

So, we have two Remote Desktop sessions and 2 COM-port devices that are visible in each session.

Is there a way to determine which device belongs to which session? 

Thanks for any help.