DESCRIPTION

This manpage describes the subset of the Cardterminal Basic Command Set (CT-BCS) used to control cardterminals with one or more integrated circuit card slots, without key pad and display. This manpage is not a complete specification of the CT-BCS, but a general overview of the most common functionalities.
 

The CT-BCS commands are constructed in compliance with ISO/IEC 7816-4 interindustry commands and are used to control cardterminal utilizing the CT-API function CT_data().
 

COMMAND STRUCTURE

A CT-BCS command is an array of bytes that is sent to the cardterminal to perform an administrative action. The CT-BCS response is an array of bytes returned by the cardterminal that informs of the completion status of the action requested.
 

The following diagram shows the general structure of a CT-BCS command:
 

|<------------------------------------------>| 
|    Header (4 Bytes)     and body           | 
|      (mandatory)       (optional)          | 
|<----------------->|<---------------------->| 
|___________________|________________________| 
|CLA |INS |P1  |P2  |Lc  |Data          |Le  | 
|____|____|____|____|____|______________|____| 
 

The following diagram shows the general structure of a CT-BCS response:
 

|<------------------------------>|<--------->| 
|           Body                    Trailer  | 
|        (optional)                (2 Bytes) | 
|                                 (mandatory)| 
|________________________________|___________| 
|Data                            |SW1-SW2    | 
|________________________________|___________| 
 

The fields within a CT-BCS command and response are equivalent to those defined by ISO/IEC 7816-4:
 

CLA

Class. The CLA value used for CT-BCS commands is 0x20.
 

INS

Instruction. Defines the action to be performed by the cardterminal.
 

P1, P2

Command parameters 1 and 2.
 

Lc

Length of command data field.
 

Le

Length of expected data:
 

Case 1: No command data, no response data (no Lc and no Le).
 

Case 2: Command data, no response data (0<=Lc<=254 and no Le).
 

Case 3: No command data, response data (no Lc and 0<=Le<=254).
 

Case 4: Command data, response data (0<=Lc<=254 and 0<=Le<=254)
 

SW1, SW2

Status bytes. Completion status of the command.
 

The address value 0x01 (CT) shall be used as destination address (dad) given to CT_data() when sending CT-BCS commands (See CT_data (3)).
 

The following commands are present in every CT-BCS implementation:
 

Basic CT commands

The following general return codes SW1-SW2 may occur:
 

General return codes

FUNCTIONAL UNITS

Functional units are entities that can be addressed as target of CT-BCS commands. In some CT-BCS commands a target functional unit needs to be specified.
 

Functional units

Support for slots 2-14 depends on the cardterminal. Functional units for keypad and display are defined for some cardterminals but are not described here.
 

COMMANDS DESCRIPTION

RESET CT

The RESET CT command asks the cardterminal to perform a reset of the specified functional unit. If the functional unit is the CT kernel, a software reset is carried out, meaning that all status information (f.i. information of inserted cards) is cleared and gathered again. For ICC functional units, an card reset is performed.
 

Optionally the answer to reset of the functional unit is returned in the response data.
 

A RESET CT command can be issued after initialization of the cardterminal or after the occurrence of a communication error.
 

The command structure is as follows:
 

CLA

0x20

INS

0x11 (=RESET CT)

P1

Functional unit:

0x00 = CT

0x01 - 0x0E = ICC Interface 1-14

P2

Command qualifier:

In case P1 = 0x00:

0x00 = No response

In case P1 = 0x01 - 0x0E:

0x00 = No response data

0x01 = Return complete ATR

0x02 = Return Historical Bytes

Lc field

Empty

Le field

Empty or 0x00: return full length of requested information
 

The response structure is as follows:
 

Data

Empty, ATR or Historical Bytes

SW1-SW2

Status Bytes

When functional unit is CT (0x00) the following status bytes can be returned:
 

0x9000

Reset successful

0x6400

Reset not successful

When functional unit is a ICC slot (0x01 - 0x0E) the following status bytes can be returned:
 

0x9000

Synchronous ICC, reset successful

0x9001

Asynchronous ICC, reset successful

0x6400

Reset not successful

REQUEST ICC

The REQUEST ICC command asks the cardterminal to wait for the presence of an ICC on the specified cardterminal slot during a specified time limit. The command synchronously blocks the caller application unless time limit 0 is specified. When an ICC is presented it is automatically activated and reset.
 

The command structure is as follows:
 

CLA

0x20

INS

0x12 (=REQUEST ICC)

P1

Functional unit:

0x01 - 0x0E = ICC-Interface 1 - 14

P2

Command qualifier: Request handling instructions for the CT
 

Lc field

Empty or length of subsequent data field

Data field

Empty (= immediate response required) or max. waiting time in seconds (1 byte, binary coding) for presenting the ICC
 

Le field

Empty or 0x00 = Return full length of requested information
 

The parameter P2 carries the request handling instructions for the CT. The value of P2 is constructed of two 4-bits subfields:
 

Bits b8-b5

•

0x0 = No meaning

•

Other values reserved for future use

Bits b4-b1

•

0x0 = No response data

•

0x1 = Return complete ATR

•

0x2 = Return Historical Bytes

The response structure is as follows:
 

Data

Empty, ATR or Historical Bytes

SW1-SW2

Status Bytes

The following status bytes can be returned:
 

0x9000

Synchronous ICC presented, reset successful

0x9001

Asynchronous ICC, reset successful

0x6200

No card presented within specified time

0x6201

Card already present and activated

0x6400

Reset not successful

0x6900

Command with timer not supported

GET STATUS

The GET STATUS command is used to gather cardterminal manufacturer information and ICC status information from the cardterminal. The information is represented by TLV (tag, length, value) encoded data objects. The tag of the data object to be retrieved is specified in the command and the value is returned in the response.
 

The command structure is as follows:
 

CLA

0x20

INS

0x13 (=GET STATUS)

P1

Functional unit:

0x00 = CT

P2

Command qualifier: Tag of data object to be returned
 

Lc field

Empty

Data field

Empty

Le field

Hx00 = Return full length of requested information
 

The response structure is as follows:
 

Data

Status information (only value field of data object)
 

SW1-SW2

Status Bytes

The following data objects are defined. Note that only value field is returned in the response:
 

Cardterminal manufacturer data object

•

Tag = 0x46

•

Length >= 15

•

Value:

CTM: Cardterminal manufacturer (5 bytes ASCII encoded). It consists of 2 bytes with the country code and 3 bytes with the manufacturer acronym

CTT: Cardterminal type (5 bytes ASCII encoded). The value is manufacturer dependant

CTSV: Cardterminal software version (5 bytes ASCII encoded). The value is manufacturer dependant
 

DD: Discretionary data (any number of bytes including 0)
 

ICC status data object

•

Tag = 0x80

•

Length

•

Value: One ICC status byte per ICC slot in the cardterminal.
 

If b8-b1 = 0x00 then no ICC is present in the slot.
 

If b1 = 1 and ICC is present in the slot and the bytes b3-b2 indicate whether the ICC is electrically connected (value 10) or electrically disconnected (value 01).
 

The following status bytes can be returned:
 

0x9000

Command successful

EJECT ICC

The EJECT ICC command asks the cardterminal to deactivate the ICC. It must be used at the end of the communication with the card or when a irreparable communication error occur.
 

The command structure is as follows:
 

CLA

0x20

INS

0x15 (=EJECT ICC)

P1

Functional unit:

0x01 - 0x0E = ICC-Interface 1-14

P2

Command qualifier: Eject handling instructions for the CT (0x00 for cardterminals without keypad and display)
 

Lc field

Empty or length of subsequent data field

Data field

Empty or time in seconds for removing the ICC

Le field

Empty
 

The response structure is as follows:
 

Data

Empty
 

SW1-SW2

Status Bytes

The following status bytes can be returned
 

0x9000

Command successful

0x9001

Command successful, card removed

0x6200

Card not removed within specified time

AUTHOR

This manual page was written by Carlos Prados <[email protected]>.