Use Serial3 plus USB for gcode, Serial2 for an RS-485 VFD
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Configuration.h
ConfigurationStore.cpp
ConfigurationStore.h
Configuration_adv.h
DOGMbitmaps.h
LiquidCrystalRus.cpp
LiquidCrystalRus.h
Marlin.h
Marlin3Serial.ino
MarlinBTSerial.cpp
MarlinBTSerial.h
MarlinSerial.cpp
MarlinSerial.h
MarlinSerial3.cpp
MarlinSerial3.h
Marlin_main.cpp
README.md
Sd2Card.cpp
Sd2Card.h
Sd2PinMap.h
SdBaseFile.cpp
SdBaseFile.h
SdFatConfig.h
SdFatStructs.h
SdFatUtil.cpp
SdFatUtil.h
SdFile.cpp
SdFile.h
SdInfo.h
SdVolume.cpp
SdVolume.h
Servo.cpp
Servo.h
cardreader.cpp
cardreader.h
conn.jpeg
dogm_font_data_marlin.h
dogm_lcd_implementation.h
esquema.png
fastio.h
language.h
motion_control.cpp
motion_control.h
pins.h
planner.cpp
planner.h
speed_lookuptable.h
spindle.cpp
spindle.h
stepper.cpp
stepper.h
temperature.cpp
temperature.h
thermistortables.h
ultralcd.cpp
ultralcd.h
ultralcd_implementation_hitachi_HD44780.h
ultralcd_st7920_u8glib_rrd.h
watchdog.cpp
watchdog.h

README.md

Marlin3Serial

Nothing fancy nor updated Marlin, but it handles three serial ports (Serial, Serial2 & Serial3) for different purposes.

Please note this code breaks many of the usual pinout on RAMPS boards.

electric connections