I don't know specific about Pi but generally serial on Linux 

To use a serial interface on a Linux box - 2 option.  
1. Dumb async terminals mode tty.
2. SLIP - TCP/IP over a serial link.

I think dumb terminal would be simplest. 

Serial line could be setup so user could then login with a shell.  

Then user could any of the usual command line stuff to communicate with
LMS (e.g. CURL command to POST/GET JSON request to get info / do
command)
Alternative could be to use CLI interface to LMS (i.e. telnet localhost
9090)  but I think is is deprecated so may have limited functionality.

Look at LMS WebUI Help -> Technical Information > The Logical Media
Command Line interface

The help provides details (maybe a bit out of date)  on CLI and JSON.

For CLI it says
>  the Logitech Media Server provides a command-line interface to the
> players via TCP/IP. After starting the server, commands and queries may
> be sent by connecting to a specific TCP/IP port. The server will reply
> echoing the request (for commands) or by returning the requested data
> (for queries). By default, the server will listen for connections on
> TCP/IP port 9090. This format is designed for ease of integration into
> AMX, Crestron and other automation systems.
> 
> The end of line separator is line feed (<LF> ASCII decimal 10,
> hexadecimal 0x0A). The server accepts LF, CR or 0x00 (or any combination
> thereof) as end of line, and replies with whatever was used for the
> command. For strings, Logitech Media Server uses the UTF-8 character-set
> encoding.
> 
> To use the command line interface interactively, use the telnet command
> from your system's command prompt: telnet localhost 9090 and when it
> connects, you can start typing commands. Beware that the server expects
> parameters to be encoded using percent-style escaping (see below); " and
> \ are not supported as in shell-like environments.


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