Usb interface, Communication parameters, Acr30 – ACS ACK30 Smart Keyboard User Manual
Page 12
ACR30 Reference Manual
Version 3.3 January 2009
Page 12 of 44
ACR30
7.0. USB Interface
The ACR30 is connected to a computer through a USB following the USB standard.
7.1. Communication Parameters
The ACR30 is connected to a computer through USB as specified in the USB Specification.
The ACR30 is working in low speed mode, i.e. 1.5 Mbps.
USB Interface Wiring
Pin
Signal
Function
1 V
BUS
+5V power supply for the reader
2 D-
Differential signal transmits data between ACR30 and PC.
3 D+
Differential signal transmits data between ACR30 and PC.
4 GND Reference voltage level for power supply
NOTE - In order for the ACR30 functioning properly through USB interface, either ACS proprietary device drive or ACS
PC/SC device driver has to be installed. Please refer to the Device Driver Installation Guide for more detail.