KEYENCE BL-600 Series - Manual (Page 100)

Chapter 6 Functions for Reading Operation
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6.2.3 Multi-label read mode 2 (Multi 2)
Multi-label read mode 1 allows the BL-600 Series to continuously read all of the
several bar codes printed on one label during one trigger input signal.
* The number of readable bar codes varies depending on the capacity of the
transmission buffer of the BL-600 Series.
➮ See page 112.
In multi-label read mode 2, all the read data is sent at one time after the trigger
input turns off.
■ Timing diagram
* The BL-600 Series continuously reads bar codes in the following periods.
• For a “Level signal” trigger ➮ See page 86. :
During the trigger input signal
• For a “One-shot” trigger ➮ See page 87. :
During the preset input time has passed
* It is necessary to set the “Repeat-reading time” ( ➮ See page 42.) to prevent the BL-
600 Series from reading the same bar code twice.
Set the “Repeat-reading time” longer than the time it takes for the read bar code
to go out of the field of the laser beam (100 ms to 25.5 s).
Note: The same type of bar code cannot be read during the specified repeat-
reading time. Different types of bar codes can be read continuously during the
period.
* The OK signal turns on if the BL-600 Series reads at least one bar code. (Com-
parison to the preset data is not performed.)
The NG signal turns on if the BL-600 Series fails to read any of the bar codes.
■ Data format
The read data is sent to the personal computer in the following format.
* Each data packet is separated by a comma (, : 2CH) (intermediate delimiter).
* The unit sends as many data packets the number of bar codes read.
* The number of bar codes varies depending on the capacity of the transmission
buffer of the BL-600 Series.
➮ See page 112.
➮ See page 113 for “header string” and “delimiter”.
Repeat reading
time
1 2 3 4 5
1 2 3 4 5
OK NG
Trigger input
Bar code
Laser beams
Communication time
OK/NG output
Header 1st data , , , , 2nd data 3rd data 4th data Delimiter •••••••