Rockwell Automation 2755 AtomScan Bar Code Reader - Manual (Page 56)

5–11 Configuring Your Reader
Publication 2755-6.9
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End of Read Cycle. Allows you to choose the circumstances that
will end the read cycle. The read cycle is the time during which
the reader will receive and process label data. When the
Triggering Mode option is set in an External or Serial mode of
operation, the trigger event initiates the read cycle.
Note: When operating in Continuous Read or Continuous Read,
1 Output, the reader is always in the read cycle.
The End of Read Cycle options are listed in the following table.
Parameter Description
Timeout
Can end the read cycle after a specified period of time, and if no label has been
read, causes a no read message, if enabled, to be transmitted.
With either External Edge, Serial Data, or Serial Data & Edge enabled, a timeout
ends the read cycle.
With External Level enabled, the read cycle does not end until the falling edge
trigger occurs, and the next read cycle does not begin until the next rising edge
trigger.
With Continuous Read, 1 Output enabled, a timeout initiates a new read cycle and
allows the same label to be read again.
New Trigger
Ends the read cycle at the occurrence of a new trigger event, and if no label has
been read, causes a no read message, if enabled, to be transmitted at the
occurrence of the new trigger event.
With either External Edge, Serial Data, or Serial Data & Edge enabled, an edge or
serial trigger ends a read cycle and initiates the next read cycle.
With External Level enabled, a falling edge trigger ends a read cycle. However, the
next read cycle does not begin until the occurrence of the next rising edge trigger.
Timeout and New
Trigger
Ends the read cycle after a specified period of time or at the occurrence of new
trigger event, and if no label has been read, causes a no read message, if enabled,
to be transmitted.
With either External Edge, Serial Data, or Serial Data & Edge enabled, a timeout, or
an edge or serial trigger, whichever comes first, ends the read cycle.
With External Level enabled, the read cycle does not end until the occurrence of a
falling edge, and the next read cycle does not begin until the next rising edge trigger.
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Timeout. Allows you to define the duration of the timeout period
in 10 millisecond increments.
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Serial Trigger Character. Allows you to define a single ASCII
character as the host serial trigger character that initiates the read
cycle. The serial trigger is considered an on-line host command
and requires the same command format as all host commands
(that is, to be entered within the < > brackets).
Note: Serial Data or Serial Data & Edge must be enabled for
Serial Trigger Character to take effect. “N/A” is displayed in the
menu when all other triggering modes are enabled.