All Digital View LCD controller boards support RS-232 connectivity for various functions. Using these commands, display system developers can enable control and monitoring from a PC (Windows or Linux) or from a custom board, for example, with a PIC microcontroller.
The specific commands for each Digital LCD controller board are listed in the manual, available for download on the specific model web page, here is a summary page of all models, https://www.digitalview.com/controllers/lcd-controllers-home.html
In addition, there is a general guide to RS-232 and Digital View LCD controller boards, download https://www.digitalview.com/downloads/application-notes/appnote-rs-232.pdf.