KEYENCE BL-700 Series - Manual (Page 49)

Chapter 3 Functions for Reading Operation
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3.2.4 Multi-label read mode 3 (Multi 3)
As described in multi-label read modes 1 and 2, this mode also allows the unit to
read several bar codes (up to 4 codes) while the trigger input is on.
The unit sends the readout data at one time according to a specified sequence
after the trigger input turns off. When up to 4 codes are in the laser beam’s field,
the unit can simultaneously reads all of them.
Operation of multi-label read mode 3
This mode allows the unit to continuously read each one of 4 bar code types “Code
1”, “Code 2”, “Code 3”, and “Code 4” as specified in the “code setup” of the setup
software (
➮ see P.61). If 3 types are specified in the “code setup”, the unit reads 3
bar codes (each of 3 types). If 2 types are specified, the unit reads 2 bar codes.
The following time chart is given.
* The above example chart is with all 4 codes specified in the “code setup” of the
setup software.
• The bar code reading sequence is not fixed.
• The unit communicates the readout data in the order of Code 1 to Code 4. After
the trigger input turns off, the unit sends all the data at one time.
• For OK/NG output, “OK” turns on if the unit reads all the specified Codes 1 to 4
and “NG” turns on if the unit fails to read at least one bar code. (Comparison to
the preset data is not performed.)
Reading data format
• Each data packet is separated by a comma (, : 2CH) (intermediate delimiter).
• If an read error occurs on any one of Codes 1 to 4, or the corresponding bar
code does not exist, “ERROR” (
➮ see P.87 for the reading error codes), instead
of the read data is sent.
➮ See P.87 for “header string” and “delimeter”.
OK
Trigger input
Bar Code
Laser beams
Communication time
OK/NG output
Code 1 Code 2 Code 3 Code 4
Code 1 Code 2 Code 3 Code 4
NG
Header
Data read
from Code
1
Data read
from Code
2
Data read
from Code
3
Data read
from Code
4
, , ,
Delimiter