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USB Interface
The ACR38 is connected to a computer through a USB following the USB standard.
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
1
V
BUS
2
D-
3
D+
4
GND
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.
Endpoints
The ACR38 uses the following endpoints to communicate with the host computer:
Control Endpoint
Bulk OUT
Bulk IN
Interrupt IN
ACR38 Reference Manual
Version 2.2 January 2008
A C R 3 8 S m a r t C a r d R e a d e r / W r i t e r
Function
+5V power supply for the reader
Differential signal transmits data between ACR30 and PC.
Differential signal transmits data between ACR30 and PC.
Reference voltage level for power supply
For setup and control purpose
For command sent from host to ACR38 (data packet size is 64 bytes)
For response sent from ACR38 to host (data packet size is 64 bytes)
For card status message sent from ACR38 to host (data packet size is 8 bytes)
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