User's Manual

PIN Pad 791 Programmer’s Manual (PCI POS-A) UDN PM0103-U Rev. 06
Section 12 –Display functionality messages 2015-04-20
Page297
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message flow:
HOST Direction PP791
Message BB (Request)


<ACK> (Good LRC)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)
Message BC (response)
<ACK> (Good echo)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)
