KEYENCE BL-180 - Manual (Page 19)

2.1 Read Operation
11
One-shot signal trigger
The unit detects the rising edge of the trigger input and starts reading bar codes
for the preset input time. The LED beam turns off after reaching the specified de-
code count and the unit sends the readout data.
The remaining actions are the same as those for level signal trigger.
1. After the trigger input exceeds the preset input times, the LED begins to emit.
• The BL-180 can read up to 4 types of bar codes without changing the bar code
type setting (see page 32).
• For general operation, see "Level signal trigger"
• Choose “One-shot signal trigger” when the trigger input signal is very short or
you want to set the input time.
2.1.2 Data-send mode
In the single label read mode only, you can select from the two data send modes
(OK/NG output on trigger) described below: In the multi-label read mode, you can
only select the “send after reading” mode.
Send after read
The unit outputs the communication and OK/NG signals after a sucessful read
(trigger output turns on as many times as the preset decode count). This is the
same operation as in the time chart described in “1.1 Scanning method”. Normal-
ly, this is the method you should use.
Send at trigger input
The unit outputs the communication and OK/NG signal when the trigger input
turns off (or the preset input time has passed if one-shot signal trigger is selected).
OK/NG NG
<Succeed to read> <Fail to read>
Trigger input
Bar code
*1
Preset input time Preset input time
LED beams
Communication time
OK/NG output
Note
OK/NG NG
<Succeed to read> <Fail to read>
Trigger input
Bar code
LED beams
Communication time
OK/NG output