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ACR38 Reference Manual version 1.9 February 2006

6. USB Interface

The ACR38 is connected to a computer through a USB following the USB standard.

6.1 Communication Parameters

The ACR38 is connected to a computer through USB as specified in the USB Specification 2.0. The ACR38

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

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 ACR38 to function properly through USB interface, either ACS proprietary device driver or ACS PC/SC

device driver has to be installed. Please refer to the Device Driver Installation Guide for more detail.

6.2 Endpoints

The ACR38 uses the following endpoints to communicate with the host computer:

Control Endpoint For setup and control purpose

Bulk OUT For command sent from host to ACR38 (data packet size is 64 bytes)

Bulk IN For response sent from ACR38 to host (data packet size is 64 bytes)

Interrupt IN For card status message sent from ACR38 to host (data packet size is 8 bytes)

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ACS ACR 38 Manuel d'utilisateur Page 8