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
Page96
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Note: If [Online Res] is ‘4’, then PIN pad will decide to approve or decline by the rule of TAC/IAC default.
Message flow:
HOST Direction PIN pad
Message T17


<ACK> (Good LRC)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)

Start Transaction Response.
Message T16
<ACK> (Good LRC)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)
