ACR39x – Reference Manual
Version 1.03
www.acs.com.hk
Page 9 of 35
6.0. Power Supply
The ACR39x requires a voltage of 5 V DC, 100 mA, regulated, power supply. The ACR39x gets
power supply from the computer (through the cable supplied along with each type of reader).
6.1. Status LED
The LED indicates the activation status of the smart card interface:
•
Flashing slowly (turns on 200 ms every 2 seconds)
Indicates ACR39x is powered up and in the standby state. Either the smart card
has not
been inserted or the smart card has not been powered up (if it is inserted).
•
Lighting up
Indicates power supply to the smart card is switched on, i.e., the smart card is activated.
•
Flashing quickly
Indicates there are communications between ACR39x and smart card.
