User's Manual

PIN Pad 791 Programmer’s Manual (PCI POS-A) UDN PM0103-U Rev. 06
Section 5 – Administration and maintenance messages 2015-04-20
Page35
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
“T”: Triple DES
“D”: Single DES
<SO> 1 <0E>
[LRC] 1 Checksum
Message flow:
HOST Direction PIN Pad
Message 04 (request)


<ACK> (Good LRC)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)

Check requested memory location
Message 04 (response)
<ACK> (Good echo)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)


<EOT>