KEYENCE BL-700 Series - Manual (Page 149)

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Appendices
Appendices
Check the bar code.
A bar code with blurred sections, defects or stains may not be read correctly.
Bar codes printed with dot matrix or ink jet printers are prone to such problems.
Check whether the transmitter (light source) and the receiver (optical pickup)
are clean.
If moisture, oil or dust adheres to the transmitter or the receiver, wipe the units
using a soft cloth and a mild plastic cleaner.
Check the environmental conditions.
➮ See “Hints on correct use” on P. 23 to 25.
Reading rate check mode is not 100%.
Check the previous item “Bar codes cannot be read”.
Note: The Read rate indicates the number of acceptable decodings (reads) during
10 scans of a bar code. When a bar code has stains or defects, the read rate is
reduced.
However, even when the read rate is 20%, 2 decodings are possible during 10
scans. Therefore, if the number of decode matches is 2, the bar code can be read.
If the trigger input can be set enough long, the read operation is not affected.
The setting data cannot be sent to the BL-700 using the BL-700 setup
software.
Is the BL-700 set to “setting data send/receive waiting status”?
Press the TEST switch for 8 seconds to enter setting data send/receive waiting
status. (The 1st, 3rd and 5th STABILITY LEDs from the top flash.) The BL-700
setup software [COM PORT] must be set as below:
• Baud rate: 9600 bit/s
• Data length: 7 bits
• Parity: Even
• Stop bits: 1 bit
Does the RS-232C pin assignment of the BL-700 (BL-U1 or BL-U2) match that
of the PC? Are the cables firmly attached?
Is power supplied to the BL-700, BL-U1 or BL-U2?
Is RS-232C used for the interface of the BL-U1 DIP switches? (
➮ See P.9.)
Cannot communicate successfully when using the PLC link.
For details, see P.116.