/// <summary>
/// Write a command to the controller
/// </summary>
/// <param name="aCommand">The command to be written. It is the <i>generic axis</i> command</param>
protected void SendCommand(AxisCommands aCommand)
{
Debug.Assert(CommandRegister.ContainsKey(aCommand));
Controller.Commands theCommand = CommandRegister[aCommand];
WriteCommand(theCommand);
}