ACR1255U-J1 – Reference Manual
Version V1.01
www.acs.com.hk
Page 11 of 73
4.3.2.
Endpoints
ACR1255U-J1 uses the following endpoints to communicate with the host computer:
4.4. NFC Interface
The interface between ACR1255U-J1 and contactless card follows the ISO 14443 or ISO 18092
specifications with certain restrictions or enhancements aimed to increase the practical functionality of
the reader.
4.4.1.
Carrier Frequency
The carrier frequency of ACR1255U-J1 is 13.56 MHz
4.4.2.
Card Polling
ACR1255U-J1 automatically polls the contactless cards that are within the field. ISO 14443-4 Type A,
ISO 14443 Type B, FeliCa, Topaz, MIFARE, and NFC tags are supported.
4.5. User Interface
4.5.1.
Keys
ACR1255U-J1 has 3 keys with locations shown in the figure below:
Key
Description
ANT_KEY
Wake up from sleep mode
MODEL_KEY
Mode selection
UPDATE_KEY
Enable boot loader
Control Endpoint
For setup and control purpose
Bulk OUT
For command to be sent from host to ACR1255U-J1
(data packet size is 64 bytes)
Bulk IN
For response to be sent from ACR1255U-J1 to host
(data packet size is 64 bytes)
Interrupt IN
For card status message to be sent from ACR1255U-J1 to host
(data packet size is 8 bytes)
