KEYENCE BL-700 Series - Manual (Page 48)

Chapter 3 Functions for Reading Operation
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3.2.3 Multi-label read mode 2 (Multi 2)
As with multi 1 mode, this mode allows the unit to read several bar codes continu-
ously while the trigger input is on. (The number of bar codes that can be read
depends on the buffer capacity. See P.86.) The difference between the two modes
is that multi 2 mode sends all the readout data at one time after the trigger input
turns off.
Multi-label read mode 2 operation
• Multi 2 mode allows the unit to read several bar codes while the trigger input is
on (or during the preset input time if one-shot signal trigger is selected) and
sends all the readout data at one time after the trigger input turns off (or after
the preset input time is expired if one-shot signal trigger is selected).
• To prevent the unit from reading the same bar code twice, the time for one bar
code to pass across the laser beam’s field and read, plus the repeat reading
time must be set (100 ms to 25.5 s). During the repeat reading time, the unit
cannot read the same bar code repeatedly, but can read different bar codes.
• A reading error is issued only when the unit cannot read any bar code while the
trigger input is on.
• For OK/NG output, after trigger input turns off, “OK” turns on if the unit reads at
least one bar code and “NG” turns on if the unit fails to read a bar code. (Com-
parison to the preset data is not performed.)
Reading data 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.
➮ See P.87 for “header string” and “delimeter”.
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 •••••••