4 read mode, Single read mode, Multi 1 read mode – KEYENCE SR-750 Series User Manual

Page 28: Read mode, Multiple code reading in single read mode, Timing chart, Setting "multi read" in the code detail settings

E SR-750 UM

4-4

Read Mode

The SR-750 Series offers 4 types of read modes. Select the appropriate type for
your application. For most applications, use "Single read mode".
* For the sake of simplicity, Input time constant + Scan delay time is not shown in

the timing chart.

Single read mode

In this mode, the SR-750 Series reads a single code while the trigger input is
turned on once, and then outputs data.
Scanning will not begin again until the timing input is first turned off, then back on
again.

Timing Chart

* The above timing chart shows the case where "Level trigger" and "Send after

reading" are selected.

• In single read mode, the data transmission timing can be selected from "Send

after reading" or "Send after timing off".

• The timing mode can be selected from "Level trigger" or "One-shot trigger".
• Scan interval is automatically set so that decoding processing can be

implemented efficiently.

"4-1 Reading Operations (Page 26)"

Multiple Code Reading in Single Read Mode

Normally, the single read mode is used to read 1 code from 1 timing input signal.
When the following read setting conditions are specified, multiple codes within the
field of view can be read with 1 timing input signal.

Setting "Multi read" in the code detail settings

When "Multi read" is selected in the code detail settings, multiple codes can be
read in 1 reading operation.
• Use the AutoID Network Navigator or setting command to set.
• The number of codes for multiple readings can be set between 2 and 16
• When "Allow reduced detection count" is selected, the reading is considered

successful if at least 1 code is read successfully.

Point

• In this setting, multiple codes of different types cannot be read

in 1 read action.

• Codes are output in order starting from the code coordinates

above the upper scan screen (if the height is the same, from the
left).

• The output data format is as follows:

,= Inter delimiter: Can be changed with setting
(Default = "," (0x2C))

Header

The 1st data , The 2nd data ,

···

Terminator

OK/NG

ERROR

Trigger input

Code

Scanning + decoding

Data communication

TRG BUSY output

(When reading is successful)

(When reading failed)

OK/NG/ERROR output

Multi 1 Read Mode

In this mode, the SR-750 Series reads multiple codes in succession while the
trigger input is turned on once.
In Multi 1 read mode, the SR-750 Series sends out data and outputs an OK signal
every time it reads 1 code (or an OK/NG signal when preset data is registered).
The SR-750 continues to scan while the trigger input is on even if no code is
present. ERROR will only be output if no code is read after the trigger signal is
turned off.

Timing Chart

• The SR-750 Series reads codes in succession for the following duration:

Level trigger : While the trigger input is turned on
One-shot trigger : During the specified one-shot trigger duration

• The duplicate reading prevention operation changes according to the setting of

the duplicate reading prevention interval reset.

"3-12 Duplicate reading

prevention interval reset" (Page 24)

• When codes with the same contents are read in succession, adjust the moving

speed so that the codes pass at intervals longer than the specified duplicate
reading prevention interval (Setting range: 0 to 25500 ms). Codes with different
contents can be read at shorter intervals.

• Each time scanning is performed in Multi 1 operation, the laser pointer lights up.

The lighting period for the laser pointer is set on "Laser-aimer blinking duration (0
to 990 ms)" and the scanning is not performed during this period.

• The data transmission timing for Multi 1 is "Send after read" only.
• In Multi 1 operation, the availability of the image save function is as follows.

Saving images
• Read OK/NG ...Cannot be used
• Error image .....Can be used