POS and receipt printers manufacturers provide procedures to install their devices in RDS environments which are specific in terms of communication speed / print format (...) 
Moreover, port COM are usually preferred to USB as it supports a wider range of hardware.

To redirect port COM you will need the procedure issued from your device manufacturer to deploy on a RDS / terminal server environment - which is very similar to TSplus. 
An RDS environment is where you install the RDS role and use redirection port COM device.

For example, you may need to change the communication speed between server on client for COM mapping depending on the settings of your POS application.