Usb Interface; Communication Parameters; Endpoints; Table 2: Usb Interface Wiring - ACS ACR40T Reference Manual

4.0. USB Interface

4.1. Communication Parameters

ACR40T is connected to a computer through USB as specified in the USB Specification 2.0. ACR40T
is working in full speed mode, i.e. 12 Mbps.
Pin Signal
1
2
3
4

4.2. Endpoints

ACR40T uses the following endpoints to communicate with the host computer:
Control Endpoint
Bulk OUT
Bulk IN
Interrupt IN
ACR40T – Reference Manual
Version 1.01
Function
V +5 V power supply for the reader
BUS
D- Differential signal transmits data between ACR40T and computer
D+ Differential signal transmits data between ACR40T and computer
GND Reference voltage level for power supply

Table 2: USB Interface Wiring

For setup and control purpose
For command to be sent from host to ACR40T
(data packet size is 64 bytes)
For response to be sent from ACR40T to host
(data packet size is 64 bytes)
For card status message to be sent from ACR40T to host
(data packet size is 8 bytes)
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