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2.0. Hardware Design
2.1. Architecture
The architecture of the ACR89U-A2 library can be visualized as the following diagram:
2.2. USB Interface
The ACR89U-A2 is connected to a computer through USB following the USB standard.
2.3. Communication Parameters
The ACR89U-A2 is connected to a computer through USB as specified in the USB Specification 2.0.,
working in full speed mode, i.e. 12 Mbps.
Pin
1
2
3
4
:
Note
In order for the ACR89U-A2 to function properly through USB interface, the device driver should
be installed.
ACR89U-A2 – Reference Manual
Version 1.01
Reader
PC
OS
OS
USB
Figure 1: ACR89U-A2 Architecture
Signal
Function
V
+5 V power supply for the reader
BUS
D-
Differential signal transmits data between ACR89U-A2 and PC
D+
Differential signal transmits data between ACR89U-A2 and PC
GND
Reference voltage level for power supply
Table 1: USB Interface Wiring
Application
acr89.dll
PC/SC
acr89fnc.sys
acr89bus.sys
CCID Layer
Application
Program
DLL Program
Driver Program
Driver Program
Page 5 of 57
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