Denso QB30-SR, User Manual, Page: 28 / 139

Chapter 7 Reading mode
The scanner is equipped with continuous scan mode capable of automatically scanning scan codes, and trigger modes used to
control scanning with external trigger signal and commands. These modes can be selected using the commands, QR Coded
parameter menu or configuration software (QB Setting).
1) Continuous reading mode
• Continuous reading mode A (Settable to QB30-SR only)
Scanning is performed repeatedly while the trigger signal is ON, and data is transferred to the host computer when scanning is
complete. Test scanning is performed repeatedly while the code is within the scanner field of view. Codes may continue to be
scanned alternately if two or more codes enter the scanner field of view.
• Continuous reading mode B
Scanning is performed repeatedly regardless of the trigger signal condition, and data is transferred to the host computer when
scanning is complete. Test scanning is performed repeatedly while the code is within the scanner field of view.
Codes may continue to be scanned alternately if two or more codes enter the scanner field of view.
• Auto sense mode
If the scanner detects an object within the scanning field of view, it enters the Active state, where it performs scanning. When
approximately 3 seconds has elapsed after scanning is complete, or if scanning is not complete approximately 3 seconds after
the scanner entered the Active state, the scanner turns off the illumination LED and enters the Code detecting state. Code
detection level can be selected from “High”, “Medium” and “Low”.
Since the scanner starts to scan when an object is detected within the scanning field of view, if the code symbol is left as is
inside the scanning field of view after scanning is complete, the scanning operation may be repeated.
Note1) If object cannot be detected due to low illumination, etc., the scanner will not enter the Active state. (Ambient
illumination of 500lx or more is necessary)
Note2) There may be times when the unit switches between the Active state and Ready state due to fluctuations in the ambient
lighting.
Scanning is performed repeatedly regardless of the trigger signal condition, and data is transferred to the host computer when
scanning is complete. Test scanning is performed repeatedly while the code is within the scanner field of view. Codes may
continue to be scanned alternately if two or more codes enter the scanner field of view.
2) Trigger scanning mode
Direct trigger mode (Settable to QB30-SR only)
Scanning starts when the trigger signal input delay time has elapsed after the trigger signal was turned ON, and continues
scanning as long as the trigger signal remains ON.
Indirect trigger mode (Settable to QB30-SR only)
Scanning starts when the trigger signal input delay time has elapsed after the trigger signal was turned ON, and continues
scanning for the indirect one-shot duration.
Direct software trigger mode
Scanning starts by the start command and ends by the scanning completion command.
Indirect software trigger mode
Scanning starts by the start command and ends by the scanning completion command. Scanning is performed at this time for
the one-shot duration in direct software trigger mode.
The time of period in which scanning is enabled is called ''Scan timing". Exposure starts at the beginning of the scan timing,
and data, if correctly scanned, is transmitted to the host before scanning is terminated. Such exposure is repeatedly attempted
until the code is correctly scanned for each scan timing. If the scan timing is terminated while the code is incorrectly scanned,
non-scan codes can be transmitted to the host. Whether non-scan codes are output and characters to be transmitted can be set
using the command or configuration software. Non-scan codes are represented as "ERROR" by default.
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