ACS ACR122 Series Guide de l'utilisateur

Advanced Card Systems Ltd. Website: www.acs.com.hk

Email: info@acs.com.hk

ACR122 NFC Contactless Smart Card Reader

Application Programming Interface

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ACR122U Application Programming iInterface

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ACR122 NFC Contactless Smart Card Reader

CONTENTS

Introduction 4

Features 4

USB interface 4

Contact and Contactless interface handling 5

Pseudo APDUs 6

Basic program flow 10

Card access 13

Appendix 23

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Introduction

The ACR122U is a PC-linked Contactless Cards reader and writer for accessing MIFARE,

ISO14443-4 Type A&B, FeliCa and NFC Tags.

Features

•USB PnP, 12Mbps

•PCSC Interface (API level only)

•CCID Standard

•Built-in Antenna for contactless tags access.

•Bi-Color LED (Rectangular Light Guide).

•Buzzer (optional)

•SAM Socket (optional)

•Compact size: 98 X 65 X 12.8mm

•Reading distance is 40~50mm (depended on the tag type)

•RoHS Compliant

•The ACR122U supports the following Tag Types:

oMIFARE Classic. E.g. MIFARE 1K, 4K and Ultralight

oISO14443-4 Type A and B.

oSony FeliCa. 212 kbps and 424 kbps

oNFC Forum Type 1. E.g. Topaz, Jewel.

USB Interface

The ACR122U is connected to a computer through USB as specified in the USB Specification 1.1.

The ACR122U is working in Full speed mode, i.e. 12 Mbps.

Pin Signal Function

1 V

BUS

+5V power supply for the reader (Max 200mA, Normal

100mA)

2 D- Differential signal transmits data between ACR122U and PC.

3 D+ Differential signal transmits data between ACR122U and PC.

4 GND Reference voltage level for power supply

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Contact and Contactless Interfaces Handling

The contactless interface is operating on the top of contact interface. Some Pseudo APDUs are

defined for contactless interface. If the reader finds that the APDUs are for contactless interface, the

APDUs will be routed to the contactless interface, otherwise, the APDUs will be routed to contact

interface. The Contact and Contactless Interfaces are able to be operating at the same time.

1. The Pseudo APDU “Direct Transmit” is used for sending commands to the contactless interface

Command

Class INS P1 P2 Lc Data In

Direct

Transmit

0xFF 0x00 0x00 0x00 Number

of Bytes

to send

PN532_Contactless

Command

2. The Pseudo APDU “Get Response” is used for retrieving the responses from the contactless

interface.

Command

Class INS P1 P2 Le

Get Response

0xFF 0xC0 0x00 0x00 Number of Bytes

to retrieve

If the reader finds that the APDU is in the form of “FF 00 00 00 Lc XX XX ..” or “FF C0 00 00

Le”, the APDU will be routed to the contactless interface.

Also, one Pseudo APDU “Bi-Color LED and Buzzer Control” is defined for controlling the LED

and Buzzer.

Command

Class INS P1 P2 Lc Data In

(4 Bytes)

Bi-Color and

Buzzer

LED Control

0xFF 0x00 0x40 LED

State

Control

0x04 Blinking Duration

Control

Similarly, if the reader finds that the APDU is in the form of “FF 00 40 XX 04 XX XX XX XX”,

the APDU will be used for setting the LED and Buzzer State.

The control interface must be activated in order to send commands to the contactless or LED

interface

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Pseudo APDUs

PSCS interface is used for exchanging APDUs and Responses between the PC and Tag. The

ACR122U will handle the required protocol internally. ACR122U comes with two primitive

commands for this purpose.

Direct Transmit

To send an APDU (PN532 and Contactless Commands), and the length of the Response Data will

be returned.

Table 1.0A: Direct Transmit Command Format (Length of the PN532_Contactless Command + 5

Bytes)

Command

Class INS P1 P2 Lc Data In

Direct

Transmit

0xFF 0x00 0x00 0x00 Number

of Bytes

to send

PN532_Contactless

Command

Lc: Number of Bytes to Send (1 Byte)

Maximum 255 bytes

Data In: PN532_Contactless Command

The data to be sent to the PN532 and Contactless Tag.

Table 1.0B: Direct Transmit Response Format (2 Bytes)

Response

Data Out

Result

SW1 SW2

Data Out: SW1 SW2

Status Code returned by the reader.

Table 1.0C: Status Code

Results

SW1 SW2 Meaning

Success 61 LEN The operation is completed

successfully. The response data has a

length of LEN bytes.

The APDU “Get Response” should

be used to retrieve the response data.

Error

63 00 The operation is failed.

Time Out

Error

63 01 The PN532 does not response.

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Checksum

Error

63 27 The checksum of the Contactless

Response is wrong.

Parameter

Error

63 7F The PN532_Contactless Command is

wrong.

Get Response

To retrieve the response data after the “Direct Command” is issued.

Table 2.0A: Get Response Command Format (5 Bytes)

Command

Class INS P1 P2 Le

Get Response

0xFF 0xC0 0x00 0x00 Number of Bytes

to retrieve

Le: Number of Bytes to Retrieve (1 Byte)

Maximum 255 bytes

Table 2.0B: Get Response Format (Le bytes, Length of the Response Data)

Response

Data Out

Result

Response Data

Data Out: Response Data, or Error Code “63 00” will be given if no response data is

available.

Remark:

In general, the Pseudo APDUs “Direct Transmit” and “Get Response” are used in pairs. Once the

APDU “Direct Transmit” is sent, the reader will return the length of the response data. Then, the

APDU “Get Response” is immediately used to retrieve the actual response data.

Bi-Color LED and Buzzer Control

This APDU is used to control the states of the Bi-Color LED and Buzzer.

Table 3.0A: Bi-Color LED and Buzzer Control Command Format (9 Bytes)

Command

Class INS P1 P2 Lc Data In

(4 Bytes)

Bi-Color and

Buzzer

LED Control

0xFF 0x00 0x40 LED

State

Control

0x04 Blinking Duration

Control

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P2: LED State Control

Table 3.0B: Bi-Color LED and Buzzer Control Format (1 Byte)

CMD Item Description

Bit 0 Final Red LED State 1 = On; 0 = Off

Bit 1 Final Green LED State 1 = On; 0 = Off

Bit 2 Red LED State Mask 1 = Update the State

0 = No change

Bit 3 Green LED State Mask 1 = Update the State

0 = No change

Bit 4 Initial Red LED Blinking State 1 = On; 0 = Off

Bit 5 Initial Green LED Blinking State 1 = On; 0 = Off

Bit 6 Red LED Blinking Mask 1 = Blink

0 = Not Blink

Bit 7 Green LED Blinking Mask 1 = Blink

0 = Not Blink

Data In: Blinking Duration Control

Table 3.0C: Bi-Color LED Blinking Duration Control Format (4 Bytes)

Byte 0 Byte 1 Byte 2 Byte 3

T1 Duration

Initial Blinking State

(Unit = 100ms)

T2 Duration

Toggle Blinking State

(Unit = 100ms)

Number of

repetition

Link to Buzzer

Byte 3: Link to Buzzer. Control the buzzer state during the LED Blinking.

0x00: The buzzer will not turn on

0x01: The buzzer will turn on during the T1 Duration

0x02: The buzzer will turn on during the T2 Duration

0x03: The buzzer will turn on during the T1 and T2 Duration.

Data Out: SW1 SW2. Status Code returned by the reader.

Table 3.0D: Status Code

Results

SW1 SW2 Meaning

Success 90 Current LED State The operation is completed

successfully.

Error

63 00 The operation is failed.

Table 3.0E: Current LED State (1 Byte)

Status Item Description

Bit 0 Current Red LED 1 = On; 0 = Off

Bit 1 Current Green LED 1 = On; 0 = Off

Bits 2 – 7 Reserved

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Remark:

A. The LED State operation will be performed after the LED Blinking operation is completed.

B. The LED will not be changed if the corresponding LED Mask is not enabled.

C. The LED will not be blinking if the corresponding LED Blinking Mask is not enabled. Also,

the number of repetition must be greater than zero.

D. T1 and T2 duration parameters are used for controlling the duty cycle of LED blinking and

Buzzer Turn-On duration. For example, if T1=1 and T2=1, the duty cycle = 50%. #Duty Cycle =

T1 / (T1 + T2).

E. To control the buzzer only, just set the P2 “LED State Control” to zero.

F. The make the buzzer operating, the “number of repetition” must greater than zero.

G. To control the LED only, just set the parameter “Link to Buzzer” to zero.

Get the Firmware Version of the reader

To retrieve the firmware version of the reader.

Table 4.0A: Get Firmware Version Command Format (5 Bytes)

Command

Class INS P1 P2 Le

Get Response

0xFF 0x00 0x48 0x00 0x00

Table 4.0B: Get Firmware Version Response Format (10 bytes)

Response

Data Out

Result

Firmware Version

E.g. Response = 41 43 52 31 32 32 55 31 30 31 (Hex) = ACR122U101 (ASCII)

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Basic Program Flow for Contactless Applications

Step 0. Start the application. The first thing is to connect the “ACR122U PCSC Interface”. The

ATR of the SAM (if a SAM is inserted) or a Pseudo-ATR “3B 00” (if no SAM is inserted) will

be returned. In other word, the SAM is always existed from the view of the application.

Step 1. The second thing to do is to change the operating parameters of the PN531. Set the

Retry Time to one.

Step 2. Poll a Contactless Tag by using “Direct Transmit” and “Get Response” APDUs (Tag

Polling).

Step 3. If no tag is found, go back to Step 2 until a Contactless Tag is found. #For ISO14443-4

tags polling, it may have to turn off the Antenna Field before starting another polling

process.

Step 4. Access the Contactless Tag by sending Pseudo APDUs. (Direct Transmit and Get

Response)

Step 5. If there is no any operation with the Contactless Tag, then go back to Step 2 to poll the

other Contactless Tag.

Step N. Disconnect the “ACR122U PCSC Interface”. Shut down the application.

Remarks:

1) Some Type A Tags may support both ISO14443-3 Type A and ISO14443-4 Type A

operating modes. For example, JCOP30 supports MIFARE 1K emulation (ISO14443-3) and

ISO14443-4. If the reader sends a RATS command to the tag, the ISO14443-4 mode will be

activated, or the tag remains in MIFARE 1K emulation mode (ISO14443-3). It is up to the

application to decide which operating mode to be activated. By default, the reader will

perform automatic ISO14443-4 activation if the tag supports ISO14443-4.

•To disable automatic ISO14443-4 activation: FF 00 00 00 03 D4 12 24

•To Enable automatic ISO14443-4 activation: FF 00 00 00 03 D4 12 34

2) The default Retry Time of the PN532 command “InListPassiveTarget” is infinity. That

means, after the polling command is sent out, the reader will wait until a valid tag is found.

If the application wants to get the immediate result of the polling command, please set the

Retry Time to one

•Set the Retry Time to one: FF 00 00 00 06 D4 32 05 00 00 00

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ACR122 NFC Contactless Smart Card Reader

3) The antenna can be switched off in order to save the power.

•Turn off the antenna power: FF 00 00 00 04 D4 32 01 00

•Turn on the antenna power: FF 00 00 00 04 D4 32 01 01

4) No Automatic Contactless Tag Insertion or Removal Event will be generated. The

Contactless Polling is done by the application.

5) The Contactless Tag is accessed through the use of Pseudo-APDUs “Direct Transmit” and

“Get Response”.

The reader will check the content of the APDU to determine which interface will be used

APDU

Standard APDU for Contact Card?

Pseudo APDU for Contactless Card?

LED and Buzzer Control?

ISO7816 T=0

Contact Interface

ISO14443

ISO18092

Contactless

Interface

LED and Buzzer

Control

SAM Socket

(Optional) Built-in Antenna

Bi-Color LED

And

Buzzer (Optional)

APDU is received by the reader

Standard

APDU for

Contact Card

Pseudo APDU

for Contactless

Card

Pseudo APDU

for LED and

Buzzer Control

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