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Enable serial interface and configure baud rates.  Each serial interface is usually a TTL serial port on the microcontroller which may be connected directly to another device.  That other device may provide a USB port, or WiFi (SWS), or Bluetooth, etc.

Change this setting by editing Config.h then compile and upload using the Arduino IDE.


  • Default Value: 9600
  • Other Values: 9600,19200,57600,115200
  • Notes: The primary interface SERIAL_A usually the same USB virtual serial port used to upload the OnStep Arduino Sketch and is also used for USB PC connections (for ASCOM for instance.)
  • Reminder:
    • This should almost never be changed.