User's Manual

PIN Pad 791 Programmer’s Manual (PCI POS-A) UDN PM0103-U Rev. 06
Section 9 – Online transaction messages with Master / Session keys 2015-04-20
Page233
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message flow: (Multiple packets)
HOST Direction PIN pad
Message Z66
(Seq'00' and type 5,7)


<ACK> (Good LRC)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)

Message Z67 (with status code '1')
<ACK> / <NAK> /
<EOT>

Message Z66
(Seq'01'--'98', type 5,7)


<ACK> / <NAK> / <EOT>

Message Z67 (with status code '1')
………………… …….. …………………………………..
Message Z66
(Sequence# larger than
last packet, type 4,6)


<ACK> / <NAK> / <EOT>

Message Z67 (with MAC)
<ACK> / <NAK> /
<EOT>
