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One page to understand FDX and HDX


In the communication method of RFID electronic tags, we often see the terms FDX and HDX, so what exactly do they mean?
FDX (Full Duplex) is full-duplex, which is a communication method that can simultaneously send and receive operations. The devices on both sides of the communication are both a transmitter and a receiver, and the two devices can transmit data in both directions at the same time.
FDX-A protocol frequency is 125 KHz generally used in industry.
FDX-B protocol frequency is 134.2 KHz is an animal standard protocol.
HDX is half duplex (Half Duplex): data transmission allows data to be transmitted in two directions, but at a certain time, only data is allowed to be transmitted in one direction.
In addition: there is a wireless communication method that requires simplex (simplex): only one party is allowed to send information to the other at the same time.
The entire data structure of FDX is 128 bits, HDX is 112 bits, and FDX has more writeable content.
DHX has a higher transmission rate than FDX, which is almost twice as fast.
HDX uses frequency conversion technology, 124.2 KHz when transmitting data 1, 134.2 KHz when transmitting data 0
Animal management Tags must comply with ISO11784/5 standards. ISO 11784 specifies the code structure of animal video recognition; ISO 11785 specifies the technical standard of animal video recognition.
ISO11784/5 Frequency range 134.2 kHz+-2 kHz; Reading distance: 5cm-21cm (handheld), Transmission method: FDX/HDX
The coding requirements for low-frequency animal labels: If you want to write the corresponding country code, you need to apply for authorization from ICAR. The International Committee for Animal Recording (ICAR).