The controller serial interface operates at 57600 baud that can be accessed using any serial TTY interface program such as PuTTY or Arduino's own Serial Monitor tool. It provides a command prompt > indicating that it is ready to receive recognized the following commands.
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-+CAL [num] <= *Sets the clock calibration for precise timing
-CAL Displays the clock calibration setting
-DIP *Sets the competition format, overriding the DIP switch settings
-FAC Sets saved EEPROM values to their original defaults
-GO Starts operation from zero seconds, equivalent to pressing the synch button
-ID [string] * Sets the callsign that gets sent
-LED [on|off] *Turns on/off LED pin
-RST Resets the processor
-SPD ID [num] * Sets the ID code speed in WPM
-STA [on|off] * Turns on/off the starting tones function
-SYN [on|off] * Turns on/off synchronization using sync button or "GO" command>
-TEM Displays the processor's temperature in C
-VER Displays the software version number
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CAL [num] <= *Sets the clock calibration for precise timing
+> CAL Displays the clock calibration setting
+DIP *Sets the competition format, overriding the DIP switch settings
+FAC Sets saved EEPROM values to their original defaults
+GO Starts operation from zero seconds, equivalent to pressing the synch button
+ID [string] * Sets the callsign that gets sent
+LED [on|off] *Turns on/off LED pin
+RST Resets the processor
+SPD ID [num] * Sets the ID code speed in WPM
+STA [on|off] * Turns on/off the starting tones function
+SYN [on|off] * Turns on/off synchronization using sync button or "GO" command>
+TEM Displays the processor's temperature in C
+VER Displays the software version number
+
* These values get stored to EEPROM and are retained between power cycles.