No. Diablo16 display modules do not directly support RS232.
However, you can use MOTG-RS232 to connect a Diablo16 display via RS232. This will require one of the COM ports.
When using a gen4-uLCD Diablo16 display, it is advisable to use a gen4-MOTG accessory board. This allows easy connectivity with the MOTG-RS232 through Diablo16’s configurable COM port.
When using a non-gen4 uLCD Diablo16 display, a MOTG-Breadtooth can be used instead.