NIUSB_SUBDEV_UNKNOWN3
writes[i].device = NIUSB_SUBDEV_UNKNOWN3;
i += ni_usb_bulk_register_read(&out_data[i], NIUSB_SUBDEV_UNKNOWN3, SERIAL_NUMBER_1_REG);
i += ni_usb_bulk_register_read(&out_data[i], NIUSB_SUBDEV_UNKNOWN3, SERIAL_NUMBER_2_REG);
i += ni_usb_bulk_register_read(&out_data[i], NIUSB_SUBDEV_UNKNOWN3, SERIAL_NUMBER_3_REG);
i += ni_usb_bulk_register_read(&out_data[i], NIUSB_SUBDEV_UNKNOWN3, SERIAL_NUMBER_4_REG);
writes[1].device = NIUSB_SUBDEV_UNKNOWN3;