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Chapter 2: Interface
2.3 LED & Beeper
Beeper makes a long beep during power up and short beep for successful barcode decoding. The
beeper can be switch on/off by setting the control register. When it is switched off, it will beep
during power up, but not during successful decoding.
There are four LEDs on DFS, LED_PWR, LED_OUT, LED_IN and LED_COMM. Their behavior
is described as below:
LED_PWR: It indicates power status, always on when connected to power.
LED_OUT: It set to represent the OUT0 to confirm whether the system is in the busy period,
decoding barcode.
LED_IN: It indicates whether the trigger is valid and acts when exposing.
LED_COMM: It represents DFS is in the start-up communication period after power on, and the
communication traffic of RS485 when it is acting.
Figure 5 shows the behavior of LEDs and beeper after power on.
Figure 5. Behavior of LEDs after power on
Table 4. Beeper Setting
Addr.
Access Bit
Symbol
Description Min Max Default Unit
0: Disable
0x0926
RW
[0] BEEP_EN
0
1
1(on)
N/A
1: Enable
DFS150-485 2D Fixed Scanner User Guide
2-6
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