RFID reader-writer is a device that can both read and write data to RFID tags. It uses radio frequency signals to communicate with RFID tags and retrieve or modify the information stored on them.

Here's a general overview of how to use an RFID reader-writer:

1. Power and Connectivity: Ensure that the RFID reader-writer is powered on and properly connected to a computer or other compatible device. This may involve connecting via USB, Ethernet, or wireless connection, depending on the specific model.

2. Software Installation: Install any necessary software or drivers that are provided with the RFID reader-writer. This software will allow you to interact with the device and configure its settings.

3. Tag Compatibility: Confirm that the RFID reader-writer is compatible with the type of RFID tags you intend to read or write. There are different frequencies and protocols used in RFID technology, so make sure the reader-writer supports the specific tags you are working with.

4. Tag Placement: Position the RFID tags within the read range of the reader-writer. The distance can vary depending on the model, but typically, the tags should be placed within a few inches or centimeters of the reader's antenna.

5. Reading Tags: Activate the reader-writer to start scanning for RFID tags. The software interface should provide options for initiating tag reading. Once the tags are detected, the reader will retrieve the stored information from the tags and display it on the screen or save it to a file.

6. Writing to Tags: If the reader-writer supports writing capabilities, use the software to specify the data you want to write to the RFID tags. This can include unique identifiers, additional information, or commands that will be stored on the tags.

7. Data Management: The software provided with the RFID reader-writer should offer features for managing the collected data. This may include saving the read or written data to a database, exporting it to a file, or integrating it with other systems.

8. Configuration and Settings: Explore the software interface to access configuration options for the reader-writer. This allows you to adjust settings such as reading range, data format, encryption, or filtering options to customize the behavior of the device to your specific needs.

It's important to consult the user manual or instructions provided by the manufacturer for your specific RFID reader-writer model, as the steps and features may vary. Additionally, consider any security or privacy considerations when using an RFID reader-writer, as it grants access to the data stored on the RFID tags.