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Rockwell Automation Publication 48CR-UM001A-EN-P - November 2019
Chapter 7
Parameter Overview
External Edge, as with Level, allows the read cycle (active state) to begin
when a trigger (change of state) from an external sensing device is
received. However, the passing of an object out of sensor range does not
end the read cycle. The read cycle ends with a good read output, or,
depending on the End of Read Cycle setting, a timeout, or new trigger
occurs.
– Serial Data
Serial Data is effective in a highly controlled environment where the
host knows precisely when the object is in the field of view. It is also
useful when you must determine if a No-read has occurred.
In Serial Data, the code reader accepts an ASCII character from the
host or controlling device as a trigger to start a read cycle. A Serial Data
trigger behaves the same as an External Edge trigger.
Serial commands are entered inside angle brackets, as shown here: <t>.
– Serial Data and Edge
Serial Data or External Edge is seldom used but can be useful in an
application that primarily uses an external sensing device but
occasionally must be triggered manually.
In this mode, the code reader accepts either a serial ASCII character or
an external trigger pulse to start the read cycle.
– Continuous Read Auto
Behaves identically to Continuous Read but maintains optimal self-
adjusting photometry and focus parameters. As a result, the
photometry parameters (Exposure and Gain) are continuously updated
with the optimal configuration parameters. In this mode, the
illumination does not strobe, but instead is always active, as images are
continuously captured. If the Auto Focus Mode field is set to 1, and if
there is a series of no-reads, this mode self-starts a focus pass. This mode
also defines how many no-reads must occur before the focus pass starts.
IMPORTANT
In Serial Data, when a non-delimited start serial character is sent a
read cycle starts; however, a non-delimited stop serial character has
no effect.
IMPORTANT
In Serial Data, when a non-delimited start serial character is sent a
read cycle starts; however, a non-delimited stop serial character has
no effect.