ACR1255U-J1 – Reference Manual
Version V1.01
www.acs.com.hk
Page 14 of 73
Mode
Color
LED Activity
Status
Red
(LED1)
Off
Battery is fully charged
Reader is powered off
The voltage of the battery is greater than3.5V and no USB
powered is being supplied
Slow flash
Low battery
On
Battery is charging
4.5.4.
Buzzer
ACR1255U-J1 has a buzzer that is used to notify user of card polling, Bluetooth connection, sleep
mode, and low-battery status.
Buzzer Activity
Event
One short beep
Card has been detected or removed
One long beep
Reader has been powered on