READER FUNDAMENTALS CHAPTER 2
READER INTERFACE GUIDE
DOC. CONTROL # 8101938-000 REV 05
16
PersistTime commands. The reader continues working until the Stop
Working Trigger conditions are met. (see below)
S
TOP WORKING TRIGGER/TIMER
Like the Start Working Trigger, the Stop Working Trigger can be a change on the
digital input lines, but can also be the expiration of a timer. Use the
AutoStopTrigger command with a rising, falling edge pattern to set the
trigger conditions.
set AutoStopTrigger=1,0 looks for a rising edge on
pin 1 before leaving the Working state. In addition, one may use the
AutoStopTimer command to repeat the Working action for a specified period
of time. For example,
set AutoStopTimer=1300 causes the reader to
perform the Working action for 1.3 seconds before moving on to the Evaluation
stage. If both a stop trigger and a stop timer are specified, whichever event
happens first fill stop the working state.
E
VALUATION
At the Evaluation decision point, the reader looks to see if new tags have been
added to the TagList since the last evaluation. If so, it drops to the
AutoTruePause state, if not, it drops to the AutoFalsePause state. Note: the
Evaluation looks at the TagList and therefore is very much dependent on the
value of the PersistTime setting.
T
RUE/FALSE PAUSE
After evaluation, the Reader sets the output lines to the values specified in the
AutoTrueOutput and AutoFalseOutput commands. This condition is
held for
AutoTruePause or AutoFalsePause milliseconds before the test
for Notification begins. For example,
set AutoTrueOutput=1 and set
AutoTruePause=20
cause the reader to hold output pin #1 high (and all
others low) for 20 milliseconds before proceeding.
N
OTIFICATION
If NotifyMode is enabled (
set NotifyMode=On) and the specified
NotifyTrigger has occurred, the reader issues an notification message. The
NotifyTrigger is specified with the
set NotifyTrigger command and can
be set to “Add”, "Remove”, “Change”, “True”, “False”, or "TrueFalse", as
described in the next topic.
If a notification is to be issued, the TagList data is sent to the
NotifyAddress.
The reader then returns to the Waiting state.
Autonomous Mode Examples
EXAMPLE 1 - BACKGROUND READING
In this case, we would like the reader to monitor the tag field continuously. The
application will periodically ask for the TagList. If a new tag is seen, output pin 1
will be flashed high for 500 msec. Otherwise, output pin 2 will be flashed high for
500 msec.
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