2 Replies - 1797 Views - Last Post: 17 September 2012 - 09:16 AM

#1 Haxor  Icon User is offline

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RFID transfer rate

Posted 17 September 2012 - 08:54 AM

Im very sorry if this is not within this forum's lines.

I wonder if anyone of you have the estimated Data transfer rate between an rfid tag and a rfid reader?
Is the dataflow stable or is it only suited for a quick 30bit transfer?

The reason to why im asking is because im researching if an rfid-ish module could be used to transfer data in a reliable and fast manner.

Mvh, Haxor.
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#2 modi123_1  Icon User is offline

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Re: RFID transfer rate

Posted 17 September 2012 - 09:07 AM

It sort of depends on the type of RFID and the manufacturer. Are you doing something that is passive that requires the the sensor's EM field to power it or will there be a battery? what sort of distance are you talking about?


An Electronic Product Code (EPC) is one common type of data stored in a tag. When written into the tag by an RFID printer, the tag contains a 96-bit string of data.


Then there's the whole 'near field' comm.


NFC is a set of short-range wireless technologies, typically requiring a distance of 4 cm or less. NFC operates at 13.56 MHz on ISO/IEC 18000-3 air interface and at rates ranging from 106 kbit/s to 424 kbit/s.


Then there's high rate theoretical ones..

End game the parameters of the project would sort of dictate where and what you are using for hardware.
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#3 tlhIn`toq  Icon User is offline

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Re: RFID transfer rate

Posted 17 September 2012 - 09:16 AM

The specs for RFID are standardized and published. It should be a simple thing to look them up and see if they meet your needs.

But it sounds like you aren't familiar with RFID so let's clear up one thing to start with: There is more than one type of RFID.

In common use:
There are High Frequency and Very High Frequency RFID chips.
There are passive and active tags.

So you are dealing with different radio bandwidths at play here and different signal strengths.

But the most important thing about RFID is that it isn't meant to be a long distance system. And it was never designed for mass data transfer.

The farthest distance I've seen in use is the highway Toll Pass stickers you get for eToll systems. You drive through the correct lane under the really big and really powerful antenna and your eToll pass responds with its number. You then get billed for that toll booth without stopping. So at most, maybe 100 feet distance using a very narrow cone of transmission. The farther the distance, the larger the antenna on the RFID tag must be - unless you shift to a powered tag (active).

Most warehousing uses RFID. WalMart makes it a requirement of all its vendors. You point an RFID gun at a pallet of merchandize and all the tags respond, so you get a count of what is actually in the cartons without opening the cartons.

But in a way it is a lot like a smart sonar. You send out a ping, you get a single packet of data back.

If you want real data transfer you probably should stick with established systems like WiFi. WiFi chips are small and don't need much power. That's why you see them in small USB dongles.

Even bluetooth would be a better direction to go as it was designed to carry ongoing bi-directional streams of data: Like continuous streams of music from your iPhone to your bluetooth headset.

This post has been edited by tlhIn`toq: 17 September 2012 - 09:18 AM

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