RFID working procedure, protocol etc.

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Hello

Dear friends, I want to know everything about the RFID systems. Protocols, components etc. Does anybody have any articles, documents?

Thank you so much.

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This lengthy Wikipedia article gives an introduction.

Microchip has good application notes:
125 KHz design guide
13.56Mhz design guide

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thank you so much. I will examine

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Are you asking about the tag protocol or the reader protocol. They are very different. I am an RF design engineer and I would not even try to develop a reader (except maybe one of those that run at 125KHz or so). The UHF readers are a particular challenge because you have to deal with multiple tags in the view field and resulting collisions - its a pain. But, I can hook up a reader to a micro or PC in a flash (more or less). There, virtually every reader has its own protocol. You just pick a reader that looks like it will do what you need to do.

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

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Espacially I wanna learn a system that is used on the highway ticket entries. The system works like that; the car has a tag and the enter of highway has a reader. When car enter to the highway the tag of car contact to the reader. This system is developed by http://www.tagmaster.com/ I want to learn the working of this system. Everything about the system.

Thank you so much.

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You want to hack it so that you wouldn't have to pay?
Basically it's just a big reader and transmitter cards. Nothing to it. Just like any other RFID system ;) (probably). Haven't seen one up close myself...

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The distances involved, multiple car/cards and the speeds make that project not like any other RFID system I think :D

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Quote:
You want to hack it so that you wouldn't have to pay?

Dont worry about it. I don't want to hack it. As I said I want to learn it and I want to develop same protocol

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The highway toll system is generally not called "RFID" by the people working in RFID. That said, there have been articles about this in "RFID Journal". It is an "active transponder" system. You will not find very much about it because the people who make it do not want it hacked. There are a number of these systems and, as far as I know, they are all different (on purpose). There does not appear to be a common "protocol". Any packet-based message system that allows for multiple devices on a common frequency should work.

Many of the toll systems have a "payment" process involved. You can pay for so many passes and each time it is used, it subtracts from the "amount" in the transponder. New amounts are added back into the transponder when you pay somewhere and the information is written back to the transponder over the RF link.

These units (at least in the US) work in "unlicensed" bands. Generally, the vehicle-mounted transponders do not require individual radio licenses, in part due to the low power they transmit with. The toll-booth unit may require licensing. Here, they seem to operate at 433MHz or 910MHz.

One of the American systems is called "SpeedPass" but it is for payment at gasoline stations. SIRIT is one of the companies that makes RF toll payment systems and there are others.

I googled: radio toll payment

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

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I see. Thank you so much for all informations. I will take into consideration all notes. If I need your ideas I will write here.

I dont want to develop a highway toll system only I want to learn the working philosophy. My project is too different.

Thank you so much.