ACR1255U-J1 – Reference Manual
Version V1.01
www.acs.com.hk
Page 10 of 73
4.0. Hardware Design
4.1. Battery
ACR1255U-J1 uses a rechargeable Lithium-ion battery, which has a capacity of 320 mAh.
4.1.1.
Battery charging
Once the battery of ACR1255U-J1 runs out, it may be charged in any of the following modes: OFF,
USB, Bluetooth; as long as it is connected to a power outlet.
4.1.2.
Battery life
The battery life is dependent on the usage of the device. Below is an estimate of the battery life
depending on the various work conditions:
Mode
Estimated Battery Life
Working Mode
10 hours
Standby Mode
21 hours
OFF Mode
8 years
Table 2
: Estimated Battery Lifespan
4.2. Bluetooth Interface
ACR1255U-J1 uses Bluetooth Smart as the medium to pair the device with computers and mobile
devices.
4.3.
USB Interface
The micro USB port is used to connect the ACR1255U-J1 to the computer as battery charging port.
This port is also used in order for the ACR1255U-J1 to operate in PC-linked mode.
4.3.1.
Communication Parameters
ACR1255U-J1 is connected to a computer through USB as specified in the USB Specification 2.0.
The ACR1255U-J1 is working in full speed mode, i.e. 12 Mbps.
Pin
Signal
Function
1
V
BUS
+5 V power supply for the reader
2
D-
Differential signal transmits data between ACR1255U-J1 and computer
3
D+
Differential signal transmits data between ACR1255U-J1 and computer
4
GND
Reference voltage level for power supply
Table 3
: USB Interface Wiring
