Home Internet of Things Aerospace Apparel Energy Defense Health Care Logistics Manufacturing Retail

Ask The Experts Forum

BlogsAsk The Experts ForumCan a Modem Be Used Instead of an Interrogator?

Can a Modem Be Used Instead of an Interrogator?

Posted By RFID Journal, 11.20.2014

We are currently working on a project to monitor the attendance of students. I would like to know if I can use a modem in place of an RFID reader. What are the necessary steps to take to enable our modem to act as a reader?

—Name withheld


It depends on the types of modems you have. Are you referring to cable modems that might also have a Wi-Fi antenna? It might be possible to have an active Wi-Fi-based RFID system send a signal to a modem via a Wi-Fi antenna. You would need to contact the active tag's manufacturer for instructions about how to do this. But I don't think it would do you any good. To use a Wi-Fi-based RFID real-time location system, you would require multiple access points and software to locate a tagged object on a map. You undoubtedly would not have enough modems with Wi-Fi antennas to locate the tags.

Moreover, if you simply need to know that students have arrived at school, rather than monitoring them continuously as they move throughout the building, then a passive high-frequency (HF) or ultrahigh-frequency (UHF) system would likely be less expensive. Active tags that communicate via Wi-Fi cost upwards of $30 apiece, whereas passive UHF tags in plastic might be priced at only $2 each.

—Mark Roberti, Founder and Editor, RFID Journal

Login and post your comment!

Not a member?

Signup for an account now to access all of the features of RFIDJournal.com!

Next Post
How Can I Track Assisted-Living Patients...
Previous Post
How Can We Implement RFID at Our Electro...
Case Studies Features Best Practices How-Tos
Live Events Virtual Events Webinars
Simply enter a question for our experts.
RFID Journal LIVE! RFID in Health Care LIVE! LatAm LIVE! Brasil LIVE! Europe RFID Connect Virtual Events RFID Journal Awards Webinars Presentations