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
Page88
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message T11 Application Select
Format: <STX>T11<ETX>[LRC]
Message length: Fixed 6 bytes.
Usage: PIN pad performs an application select on the active smart card. PIN pad will also
prompt user to insert its card if the card has not yet presented. PIN pad will send the
message T12 (Application Selection Response) to host.
Message element:
Field Length Value and description
<STX> 1 <02>
T11 3 Message ID
<ETX> 1 <03>
[LRC] 1 Checksum
Message flow:
HOST Direction PIN pad
Message T11


<ACK> (Good LRC)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)

Application Select Response.
Message T12
<ACK> (Good LRC)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)
