The Einsy/Rambo board that Marlin firmware typically runs on has a J19 socket that includes TX and RX pins.
Under what circumstances does the Marlin firmware send and receive messages via those pins?
Is there something that needs to be set up in order to get those pins to be used for messages over those pins?
When Marlin IS set up to use those pins for messages, what class or object within Marlin is used for sending/receiving messages via those pins (e.g. MarlinSerial)?
Under what circumstances does the Marlin firmware send and receive messages via those pins?
Is there something that needs to be set up in order to get those pins to be used for messages over those pins?
When Marlin IS set up to use those pins for messages, what class or object within Marlin is used for sending/receiving messages via those pins (e.g. MarlinSerial)?