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
Page41
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message flow:
HOST Direction PIN Pad
Message 09 (request)


<ACK> (Good LRC)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)

Message 09 (response frame)
<ACK> (Good echo)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)

Message 09 (response)


<ACK> (Good LRC)
<NAK> (Bad LRC)

Message 09 (result frame)
<ACK> (Good echo)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)

<EOT>