RS485 Project to control stepper & servo motors

We have the following system: 1) PCBA with Atmega2560 2) Servo Motor with driver (3Nos) 3) Stepper Motor with driver (7Nos) 4) M007 Touchscreen (HMI) Software for HMI: [login to view URL]!AouhlXXdprIt6x5TNRusQYstzHWT. (Use the latest version) Please find the data sheet of all attached along with the schematic of the PCBA. We need to create a simple program to control all stepper and servo motors. Stepper MOTOR 1: <BUTTON "Left Turn"> <"BUTTON "Right Turn"> <Button "ON"> <Button "OFF"> Stepper MOTOR 2: <BUTTON "Left Turn"> <"BUTTON "Right Turn"> <Button "ON"> <Button "OFF"> Stepper MOTOR 3: <BUTTON "Left Turn"> <"BUTTON "Right Turn"> <Button "ON"> <Button "OFF"> Stepper MOTOR 4: <BUTTON "Left Turn"> <"BUTTON "Right Turn"> <Button "ON"> <Button "OFF"> Stepper MOTOR 5: <BUTTON "Left Turn"> <"BUTTON "Right Turn"> <Button "ON"> <Button "OFF"> Stepper MOTOR 6: <BUTTON "Left Turn"> <"BUTTON "Right Turn"> <Button "ON"> <Button "OFF"> Stepper MOTOR 7: <BUTTON "Left Turn"> <"BUTTON "Right Turn"> <Button "ON"> <Button "OFF"> Servo MOTOR 1: <BUTTON "Left Turn"> <"BUTTON "Right Turn"> <Button "ON"> <Button "OFF"> Servo MOTOR 2: <BUTTON "Left Turn"> <"BUTTON "Right Turn"> <Button "ON"> <Button "OFF"> Servo MOTOR 3: <BUTTON "Left Turn"> <"BUTTON "Right Turn"> <Button "ON"> <Button "OFF">