code: @Override
      protected int serializeBytes1to3 () {
  
          int line = status.value();
          if (acknowledgeFlag) {
              line |= ACKNOWLEDGE_FLAG_MASK;
          }
          if (residualOverflow) {
              line |= Constants.READ_RESIDUAL_OVERFLOW_FLAG_MASK;
          }
          if (residualUnderflow) {
              line |= Constants.READ_RESIDUAL_UNDERFLOW_FLAG_MASK;
          }
          if (statusFlag) {
              line |= STATUS_FLAG_MASK;
          }
  
          return line;
      }
docs: {@inheritDoc}