This board does the analog-to-digital conversion.
3.4.4.2 ISO 18000 Part 7 RFID Standard
The ISO 18000 Part 7 standard [2] is an international standard that de?¬?nes the air interface
for RFID devices used in item management applications. The standard de?¬?nes the forward
and return link parameters for an active RFID air interface at 433 MHz and the communications
protocol used.
Figure 3.26 shows the interrogator-to-tag command format for the Collection command.
The command contains a command code to signal the tag what type of command is issued.
Additionally, the command contains a CRC to ensure the command packet is properly
formed. The remainder of the packet contains particular ?¬?elds appropriate to the command.
Similarly, the tag response includes the command code, CRC, and other data ?¬?elds.
The tag response also includes a tag status ?¬?eld, which consists of nested ?¬?elds such as
acknowledge, tag type, battery, etc.
Figure 3.27 shows an example RFID macros ?¬?le containing the Collection primitive. The
corresponding SDFG representation is shown in Figure 3.28. Thus, RFID compiler has been
used to implement all the commands from ISO 18000 Part 7 for microprocessor-based as
well as custom hardware-based tags.
3.4.4.2.1 Microprocessor-Based Tag
The RFID compiler was used to generate three programs: A with 24 primitives, B with 12
primitives, and C with 4 primitives.
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