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

Page103

Uniform Industrial Corp. Proprietary and Confidential Total 342 pages

Message T21 Get Transaction Result’s Data

Format: <STX>T21[DOL]<ETX>[LRC]

Message length: Var.

Usage: PIN pad will retrieve the data that list on the DOL after EMV transaction done. PIN pad

will send the message T22 (Get Transaction Result’s Data Response) to host.

Message element:

Field Length Value and description

T21 3 Message ID

DOL Var Data Object List, each object is expressed

by tag number, and <SUB> is used to

delimit each object. For example,

9F12<SUB>9A<SUB>9F02<SUB>….

[LRC] 1 Checksum

Message flow:

HOST Direction PIN pad

Message T21



<ACK> (Good LRC)

<NAK> (Bad LRC)

<EOT> after 3 NAKs



Get Transaction Result’s Data

Response.

Message T22

<ACK> (Good LRC)

<NAK> (Bad LRC)

<EOT> (after 3 NAKs)

