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CHAPTER 3 TAG FUNDAMENTALS

READER INTERFACE GUIDE

DOC. CONTROL # 8101938-000 REV 05

that there are no more names to be heard, you move on to the letter ‘B’ and

repeat the series. By the time you’ve been through the letter ‘Z’, you should have

been able to get everyone’s name, and everyone should be sitting down. At this

point the sort has been finished.

Obviously this sort algorithm is far more complex than the global scroll algorithm,

requiring many more reader-tag instructions. However the Alien RFID Reader

considerably optimizes this basic sort method, and in doing so still provides a

very fast and efficient sort algorithm.

Acquire Parameters

When the reader scans for tags, it can automatically perform a complex

sequence of repeated wakes, sleeps, and reads. This sequence is defined by the

acquire parameters, and by adjusting each value you can configure the Reader

to perform optimally, depending on the particular use case.

When the reader does an acquire action, it performs a total number of acquire

cycles specified by the

AcqCycles parameter. Each cycle consists of a number

of Wakes (given by

AcqEnterWakeCount) on each antenna, then a number

of reads (given by

AcqCount) and Sleeps (given by AcqSleepCount) on

each antenna. Finally, after all of the cycles have completed, a number of Wakes

(given by

AcqExitWakeCount) are issued on each antenna.

The Wakes and Acquires all act on the current Tag Mask. The Sleeps act only on

tags as they are found.

The acquire parameters are demonstrated by the following pseudo-code:

foreach cycle in AcqCycles

foreach wake in AcqEnterWakeCount

foreach antenna in AntennaSequence

Wake (using current mask)

next antenna

next wake

foreach count in AcqCount

foreach antenna in AntennaSequence

DoAcquisition (using currentMask)

foreach sleep in AcqSleepCount

Sleep(TagsFound)

next sleep

next antenna

next count

next cycle

foreach wake in AcqExitWakeCount

foreach antenna in AntennaSequence

Wake(currentMask)

next antenna

next wake

Masks and Tag Memory Structure

Many commands aimed at Alien RFID tags require the setting of a mask, which

directs the commands only at the tags who's ID matches the mask. This

Brand	Alien Technology
Model	ALR-9800
Category	Scanner
Language	English

Alien Technology ALR-9800 User Manual

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Alien Technology ALR-9800 Specifications