Denso QK31-R, User Manual

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Chapter 6 Scanning Control
6.1 Software Control
You can control the scanner by sending scanning control commands from the host computer via the RS-232C or
USB-COM interface. (For details about control commands, refer to Appendix 2.)
Commands Description
R
Ready-to-scan command
Upon receipt of one of these commands, the scanner lights the illumination LEDs and
becomes ready to scan.
Z
Standby command
Upon receipt of one of these commands, the scanner turns off the illumination LEDs and
switches to standby.
Each of these commands should be enclosed with a header and terminator for transmission according to the
communications conditions of the scanner.
6.2 Automatic detection of labels
Bringing a code label within the scan range of the scanning window turns on the illumination LEDs and starts the
scanner reading the code.
The illumination LEDs come on when you bring a code label within the designated range or move a code label within
the same range. These LEDs go off when a code label is moved away from the range or stays within the range without
move for approx. 3 seconds.
The scanner offers a choice of three code response levels for responding to codes. Switch to a higher code response
level if the illumination LEDs will not come on when a code is brought into the range, for example.
The code response
level can be specified with the configuration software (ScannerSetting_2D).
Note: Even if you do not bring a code label within the scan range, the illumination LEDs may come on when the
ambient level of light changes or any shadows move within the scan range.
Note: To enable the scanner to work properly, an ambient illuminance of at least 30 lx is required.