User's Manual

PIN Pad 791 Programmer’s Manual (PCI POS-A) UDN PM0103-U Rev. 06

Section 6 – Contact EMV Level 2 transaction messages 2015-04-20

Page93

Uniform Industrial Corp. Proprietary and Confidential Total 342 pages

Message T16 Start Transaction Response

Format: <STX>T16[Status][Reason][Err Message][Result]<SUB>

<Advice Need><Reversal Need><Financial Need><ETX>[LRC]

Message length: Variable.

Usage: The message contains the transaction result on the smart card to be sent to terminal.

Message element:

Field Leng

Value and description

T16 3 Message ID

Status 1 0:OK; 1:Fail

Reason 1 Optional. (If Status = 1)

1:Fatal Error

2:Command Format Error

Err Message 8 Optional, if Reason = ‘1’Hex String

Result 2 Optional. (If Status = 0)

‘Y1’: Offline Approved,

‘Z1’: Offline Declined

‘Y3’: Unable to go online,

Offline Approved

‘Z3’: Unable to go online, Offline Decline.

‘Y4’: Online Approved

‘Z4’: Online Decline

‘A1’: Online Authorize Request,

‘A4’: Application reselection.

<Reversal Need> 1 0: Terminal does not need to send a reversal to

host for this transaction

1: Terminal should send a reversal to host for this

transaction.

[LRC] 1 Checksum

Note: If the [Result] is ‘A1’, then terminal should send online authorization request to issuer host; and

after done, send message T17 to PIN pad to continue transaction. (See EMV 4.3, book 3, chap 9,

figure 7)

Note: If the transaction is switched to MSR processing, T16 will always return “A1” in [Result] field.

Note: If the previous selected application on IC card can’t do the transaction (for example, this