Technical Overview

Magellan's Phase Jitter Modulation (PJM) Protocol combines very high communication data rates with Frequency and Time Division Multiple Access (FTDMA) anti-collision capabilities. The protocol and command set allows users to identify, read and write to a large quantity of tags continuously entering and leaving the reader field at high speeds.

Thus the PJM protocol is the only existing RFID protocol capable of full dynamic processing of RFID tagged items. Other protocols need to identify all tags before they can read or write to individual tags, which is especially unstable in dynamically changing tag populations. Only PJM can efficiently use on-chip tag memory in reading and writing without losing necessary performance.

PJM offers tremendous margins in its anti-collision speeds, anti-collision capability and data rates. Furthermore only PJM offers a stackable RFID tag (PJM StackTag®) which can be stacked with zero separation, even in hundreds.

 

  Performance

  

  Features

Magellan's readers and tags are perfectly matched and achieve the highest system performance in the worldwide RFID industry. Due to the robustness of the PJM technology this performance can be implemented and demonstrated any time.

Such high performance offers sufficient margin and is mandatory for achieving 6-sigma installations and system performance. All performance values are measured on standard readers and tags using a MARS-24 and PJM StackTag® labels. 

 

Specifications

  • Reliable Identification rates of over 600 tags per second
  • Identify, write and verify 64 bit blocks in user memory in less than 10ms per 64 bit block
  • Write an incrementing 128 bit serial number at a rate of 50 items per second moving in a single line on a conveyor belt (includes identification, reading, writing and verifying 128bit)
  • Identify and read 128 bits of data at a rate of 250 items per second moving in a single line on a conveyor belt
  • Identify and read 128 bits of data from 100 items in boxes moving at a rate of 2.5 cases per second
  • Identify and write and verify 256 bit data into user memory to 120 vials/bottles simultaneously which are static on a reader antenna in less than 2 seconds.

 

  

Operating frequency is 13.56MHz

Uses 8 reply channel frequency bands

Anti-collision speed of 1200 items per second

Anti-collision capability of more than 32,000 tags on one antenna

Command data rates of 424kbit/s between reader and tags

Tag reply data rate of 106kbit/s on 8 independent reply channels

Effective reply data rate of 848kbit/s when dealing with many tags

Full duplex air interface communication

Password (48bit) protected write access

Memory lock pointers for permanently locking memory sectors

Continuous identification, read and write of dynamic tag populations

High resolution timestamps to establish the order of tags

Tags can be muted and retain status during field power breaks

Application and Conditional Group Identifiers to support tag filtering

     

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