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
Page299
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message BFScreen Saver Preview / Stop Preview
Format: <STX>BF[Op]<ETX>[LRC] (request)
Message length: Fixed 6 bytes.
Usage: Use this message to launch screen saver directly or turn it off. User can also issue any
other message to turn off screen saver.
Request frame (HOST to PP791)
Field Length Value and description
<STX> 1 <02>
BF 2 Message ID
[Op] 1 '0': Stop screen saver preview
'1': Screen Saver Preview
<ETX> 1 <03>
[LRC] 1 Checksum
Message flow:
HOST Direction PP791
Message BF (Request)


<ACK> (Good LRC)
<NAK> (Bad LRC)
<EOT> (after 3 NAKs)