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Rockwell Automation Publication 48CR-UM001A-EN-P - November 2019
Chapter 7
Parameter Overview
End of Read Cycle
The read cycle is the time during which the code reader attempts to capture and
decode a symbol. A timeout, a new trigger, or by the last frame in a capture
sequence (or a combination these options), can end a read cycle.
Figure 24 - AOP
Figure 25 - WebConnect
Mode
– Timeout
Typically used with Serial Data or External Edge and Continuous Read
1 Output. It is effective in highly controlled applications when the
maximum length of time between objects can be predicted. It helps
verify that a read cycle ends before the next symbol appears, which gives
the system extra time to decode and transmit the data to the host.
Timeout ends the read cycle, which causes the code reader to stop
reading symbols and send the symbol data or No-Read message when
the time set in Timeout elapses (times out), if When to Output is set to
End of Read Cycle.
If in Continuous Read 1 Output, a timeout initiates a new read cycle
and allows the same symbol to be read again.
With External Edge, Serial Data, or Serial Data or External Edge
enabled, a timeout ends the read cycle and symbol data or a No-Read
message is sent to the host.
With External Level enabled, the read cycle does not end until the
falling edge trigger occurs or a timeout occurs. The next read cycle does
not begin until the next rising edge trigger.
IMPORTANT
When operating in Continuous Read or Continuous Read 1 Output, the code
reader is always in the read cycle.
• Default: Timeout
• Options: 0 = Timeout
1 = New Trigger
2 = Timeout or new Trigger
3 = Last Frame
4 = Last Frame or New Trigger