Before proceeding with Moxa, check with your IT department if they utilize port security. Being a school, I would imagine this might be the case.
We use it at our company to detect unauthorized devices such as switches, wireless and other devices connected to our network. Users would bring in devices from home and plug it into the network for whatever reason. If our network detect such a device, that port is shutdown and an alert is sent.
A step further on port security, is to have each 'legal' device registered and must authenticate by device name and user logon, before the port is turned on for data access.