code evaldrv8711

It's possible to have a more detailed explanation of the task 0  of   code evaldrv8711?
In the program I do not understand why it is used dacconverter , if  in schematic  the  tracks  of  dac is not connected to anything.
Thank you

            break;
// DAC 0 Config and Write [ OPCODE = 5 ] [ Config HB ] [ Config LB ] [ Data HB ] [ Data LB ]
      case (DAC0_UPDATE):
            DAC12_0CTL = 0;
            DAC12_0CTL = (SerialBuffer[1] * 256) + SerialBuffer[2];
            DAC12_0DAT = (SerialBuffer[3] * 256) + SerialBuffer[4];
            break;
// DAC 1 Config and Write [ OPCODE = 6 ] [ Config HB ] [ Config LB ] [ Data HB ] [ Data LB ]
      case (DAC1_UPDATE):
            DAC12_1CTL = 0;
            DAC12_1CTL = (SerialBuffer[1] * 256) + SerialBuffer[2];
            DAC12_1DAT = (SerialBuffer[3] * 256) + SerialBuffer[4];
            break;