User's Guide

ThingMagic M6e User Guide 33
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In addition to setting the delimiter to 1, a TagFilter of the class ISO180006b.Select must be used in order to
read certain ISO18000-6b tags, specifically one of the following options must be used:
GROUP_SELECT_EQ
GROUP_SELECT_NE
GROUP_SELECT_GT
GROUP_SELECT_LT
GROUP_UNSELECT_EQ
GROUP_UNSELECT_NE
GROUP_UNSELECT_GT
GROUP_UNSELECT_LT
AEI ATA
AEI ATA Protocol with Stop Trigger Read Plan
The AEI ATA protocol is supported on the M6e module with an optional license key. The ATA protocol is
supported under a Stop Trigger Read Plan so that results can be provided continuously instead of at the
end of a read cycle.
Universal Reader Assistant now supports readers which have been licensed to read the AEI ATA or IP-X
protocols. The “Tag Inspector” tab can interpret the information in AEI ATA tags per the AAR S-918
encoding standard.
Tag Handling
When the M6e performs inventory operations (MercuryAPI Read commands) data is stored in a Tag Buffer
until retrieved by the client application, or streamed directly to the client if operating in Tag Streaming/
Continuous Reading mode.
Tag Buffer
The M6e uses a dynamic buffer that depends on EPC length and quantity of data read. As a rule of thumb
it can store a maximum of 1024 96-bit EPC tags in the TagBuffer at a time. Since the M6e supports
streaming of read results the buffer limit is, typically, not an issue. Each tag entry consists of a variable
number of bytes and consists of the following fields:
Tag Buffer
Total Entry Size Field Size Description
68 bytes
(Max EPC
Length = 496bits)
EPC
Length
2 bytes Indicates the actual EPC length of the tag
read.
PC Word 2 bytes Contains the Protocol Control bits for the tag.
EPC 62 bytes Contains the tagʼs EPC value.
Tag CRC 2 bytes The tagʼs CRC.
Tag Read Metadata