Usb Interface; Communication Parameters; Endpoints; Table 2: Usb Interface Wiring - Advanced Card ACR39x Reference Manual

4.0. USB Interface

4.1. Communication Parameters

The ACR39x is connected to a computer through USB as specified in the USB Specification 2.0. The
ACR39x is working in full speed mode, i.e. 12 Mbps.
Pin Signal
1
2
3
4

4.2. Endpoints

The ACR39x uses the following endpoints to communicate with the host computer:
Control Endpoint For setup and control purpose.
Bulk-OUT
Bulk-IN
Interrupt-IN
ACR39x – Reference Manual
Version 1.03
Function
V +5 V power supply for the reader
BUS
D- Differential signal transmits data between ACR39x and computer
D+ Differential signal transmits data between ACR39x and computer
GND Reference voltage level for power supply

Table 2: USB Interface Wiring

For command to be sent from host to ACR39x.
(Data packet size is 64 bytes)
For response to be sent from ACR39x to host.
(Data packet size is 64 bytes)
For card status message to be sent from ACR39x to host.
(Data packet size is 8 bytes)
Page 7 of 35
info@acs.com.hk
www.acs.com.hk