Usb Interface; Communication Parameters; Endpoints; Table 1: Usb Interface Wiring - ACS ACR33U-A1 Smart Duo Reference Manual

6.0. USB Interface

The ACR33U-A1 SmartDuo is connected to a computer through a USB following the USB standard.

6.1. Communication Parameters

The ACR33U-A1 SmartDuo is connected to a computer through USB as specified in the USB
Specification 2.0. The ACR33U-A1 SmartDuo is working in full speed mode, i.e. 12 Mbps.
Pin
1
2
3
4
Note:
proprietary device driver or ACS PC/SC device driver has to be installed.

6.2. Endpoints

The ACR33U-A1 SmartDuo uses the following endpoints to communicate with the host computer:
Control Endpoint
Bulk OUT
Bulk IN
Interrupt IN
ACR33U-A1 SmartDuo Reference Manual
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Version 1.00
Signal Function
V +5 V power supply for the reader
BUS
D- Differential signal transmits data between ACR33U-A1 and PC.
D+
Differential signal transmits data between ACR33U-A1 and PC.
Reference voltage level for power supply
GND
Table 1:
In order for the ACR33U-A1 SmartDuo to function properly through USB interface, either ACS
For setup and control purpose
For command to be sent from host to ACR33U-A1 (data packet size is
64 bytes)
For response to be sent from ACR33U-A1 to host (data packet size is
64 bytes)
For card status message to sent from ACR33U-A1 to host (data packet
size is 8 bytes)
Table 2: ACR33U-A1 SmartDuo Communication Endpoints
Document Title Here
USB Interface Wiring
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