Trying to communicate to bluetooth port and normal ethernet port at same time.
So I am using a raspberry pi 4 model B that is connected to the arduino mega 2560 and a ramps 1.4. I have the arduino flashed, and am able to control my printer fully from a program that I wrote in python on the raspberry pi. I do not use the Repetier host program, as I am controlling something that isn't exactly a 3D printer... It just uses a X and Y motor to move a tool around, and I am using repetier to bridge the communications between my program on the pi, and the gcode I send over the serial port ttyACM0 to the arduino.
I am now trying to implement another machine into my program. It is a welder that communicates over RS485 modbus and I thought that maybe I could use one of the serial lines in the arduino to communicate to it. I want to use the serial2 pins (17(RX), 16(TX)) but am unsure on if I can communicate to the welder through repetier. Can I specify which port I am talking to on the arduino output?
For example, I can open python on my raspberry pi and connect to the serial line on the arduino, then I will just send a command such as G28, and it will home. I do not specify that it should communicate with the motors, it just does it.
Now what I would like to do is for me to specify that I want it to send either to the motors, or to the welder. If anyone can help me with this, that would be great. If I did not explain this the best please let me know and I will elaborate.