Chapter 6 Reading Control; Trigger Switch Control - Denso AT20B-SM User Manual

Chapter 6 Reading Control

Two types of reading controls are available--Trigger switch control and Software control.
Trigger switch control: Pressing the trigger switch readies the scanner for reading. (Refer to Section 6.1.)
Software control: Instead of pressing the trigger switch, you send control commands from the host computer via
the RS-232C or USB-COM interface to ready the scanner for reading or put the scanner on standby.
(Refer to Section 6.2.)
In addition, the auto sensing mode and auto stand mode is also available. (Refer to Sections 6.3.)

6.1 Trigger Switch Control

Pressing the trigger switch turns on the illumination LEDs and readies the scanner for reading. The scanner
supports the following five trigger switch operating modes. Select the one that best meets your needs using the
bar coded parameter menu or the configuration software (Scanner Setting).
(1) Auto-off mode
When the trigger switch is pressed, the scanner is brought to the Active state for approximately five seconds.
The scanner automatically returns to the Ready state when reading is successfully completed, or after
approximately five seconds elapsed with the trigger switch pressed.
The scanner goes to the Ready state if the trigger switch is released before five seconds elapses.(in the case of
normal mode)
When the Auto off mode is set to be active only once (one-shot mode), the time required for the scanner to
become the Ready state after the trigger switch was pressed shall be designated in the setting.
(2) Momentary switching mode
The scanner is brought to the Active state only when the trigger switch is pressed, and returns to the Ready state
when the trigger switch is released.
(3) Momentary switching mode (Inversion type)
The scanner is brought to the Ready state only when the trigger switch is pressed, and returns to the Active state
when the trigger switch is released.
(4) Alternate switching mode
The scanner alternates between the Active state and the Ready state every time the trigger switch is pressed.
(5) Continuous reading mode 1
When you turn the scanner on, the scanner lights the illumination LEDs and becomes ready to scan. The scanner
ignores all trigger switch input.
If the scanner receives the Z, READOFF or LOFF command, it switches to standby; if it receives the R, READON
or LON command, it becomes ready to scan.
You can select whether or not the scanner transmits the ERROR command when the scanner cannot complete
reading and switches to standby, using the configuration software (Scanner Setting).
(6) Continuous reading mode 2
This mode is functionally equivalent to the continuous reading mode 1, except that the scanner waits for a
command upon completion of reading.
To become ready to scan, the scanner should receive the Z, READOFF or LOFF command to switch to standby
and then receive the R, READON or LON command.
You can select whether or not the scanner transmits the ERROR command when the scanner cannot complete
reading and switches to standby, using the configuration software (Scanner Setting).
Note: When you are setting parameters using the bar coded parameter menu, the scanner is always in the
auto-off mode regardless of the trigger switch operating mode selected.
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