Configuring add.serial port on Ruma +, need help...

Hello all,

Working on a custom project that will use a 7"tft/Mega combo as a touch screen for my reprap with a Rumba+.
The interface between the two systems will (hopefully) be via serial comms.

By Marlin default, the board uses Serial 0 for communication, Serial 0 is the usb port on the board. this is fine and works.

The board however has an additional Serial port on EXP3 (RX3, TX3 on pins PJ0, PJ1).

My issue is..
- How can I activate dual serial ports in Marlin?
- Both comms to work in parallel with each other?

I've been searching on this subject for the last couple of days, but have not found what I'm looking for.....
Any help / guidance would be greatly appreciated...

Bart

Marlin has no support for dual serial.

use D0/D1 (also known as tx0/rx0)
And ensure that the usb and the screen never talk at the same tame and are same baud rate.
This is how mks tft does it

Okie doke....thanks for the reply, that answers my question...