User's Manual

 Advanced Card Systems Ltd. Page 18 of 46
3. USB Interface
The ACR1222U is connected to a computer through USB interface as specified in the USB
Specification 2.0. The ACR1222U is working in full speed mode, i.e. 12 Mbps.
USB Interface Wiring
Pin Signal Function
1 V
BUS
+5V power supply for the reader (~200mA)
2 D-
Differential signal transmits data between ACR1222U and PC.
3 D+
Differential signal transmits data between ACR1222U and PC.
4 GND
Reference voltage level for power supply
NOTE - In order for the ACR1222U functioning properly through USB interface, ACS
proprietary device drive has to be installed. Please refer to the Device Driver Installation Guide for
more details. {VID = 0x072F; PID = 0x1280}
4. ICC Interface (Contact Smart Card)
A landing type Smart Card Acceptor is used for providing reliable operations. The minimum life
cycle of the acceptor is about 300K times of card insertion and removal.
5. SAM Interface (Contact Smart Card)
One SAM socket is provided for highly secure application requirement.
6. PICC Interface (Contactless Smart Card)
A built-in antenna is used for communication between the PCD and PICC.