ACR1255U-J1 – Reference Manual
Version V1.01
www.acs.com.hk
Page 5 of 73
1.0. Introduction
ACR1255U-J1 Bluetooth® NFC Reader acts as an interface for the communication between a
computer/mobile device and a contactless smart card or NFC-enabled device. It establishes a uniform
interface from the computer/mobile device to the smart card for a wide variety of cards. By taking care
of the card’s particulars, it releases the computer software programmer from being responsible with
smart card operations’ technical details, which in many cases, are not relevant to the implementation
of a smart card system.
1.1. Symbols and Abbreviations
Abbreviation Description
ATR
Attribute Request and Attribute Response
DEP
Data Exchange Protocol Request and Data Exchange Protocol Response
DSL
Deselect Request and Deselect Response
PSL
Parameter Selection Request and Parameter Selection Response
RLS
Release Request and Release Response
WUP
Wakeup Request and Wakeup Response
DID
Device ID
BS
Sending bit duration
BR
Receiving bit duration
PP
Protocol Parameters
Table 1
: Symbols and Abbreviations
