ALIEN READER PROTOCOL CHAPTER 4
READER INTERFACE GUIDE
DOC. CONTROL # 8101938-000 REV 05
70
AutoStopTimer
(250ms)
Class 1
(125ms)
Class 0
(224ms)
a1
a2
a3
a1
(112ms)
a2
(112 ms)
First, the reader recognizes that it has to use two tag protocols, so it divides the
allotted 250ms equally among them. It uses the first 125ms to find as many
Class1 tags as possible on the three antennas. Since Class0 uses a minimum of
112ms per antenna, it has just enough time to search the first antenna, and start
looking on the second antenna. The reader does not have time to search the
third antenna for Class0 tags. (Notice that it does extend the AutoStopTimer long
enough to finish the current acquisition).
Using the equation given previously, the minimum value to use for
AutoStopTimer should be:
AutoStopTimer
min
= max(20*16ms, 20*1.4ms) * 2 * 3
= max(320, 28) * 6
= 1920 ms
In this case, the reader schedules its time as follows:
AutoStopTimer
(1920ms)
Class1
(960ms)
Class0
(960ms)
a1
a2
a3
a1
320
ms
a2
320
ms
a3
320
ms
Now there is plenty of time to read all protocols on all antennas.
AutoTrueOutput
9800 | 9780 | 8780 | 9640 | 9774
The AutoTrueOutput specifies the output pin settings to effect if the evaluate
mode of Autonomous Mode evaluates to true. The parameter is a bitmap for the
four external output pins, where a "1" sets a pin to high, and a "0" sets a pin to
low. Output pin 1 is specified by bit 0 in the mask, output pin 2 is specified by bit
1 in the mask, etc.
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