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
Page225
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message Z51 String Entry Response
Format: <STX>Z51[string]<ETX>[LRC]
Message length: Variable, maximum 55 bytes.
Usage: This is the response frame of Z50.
Message element:
Field Length Value and description
<STX> 1 <02>
Z51 3 Message ID
[string] 1..49 User inputted string.
‘?’ means time out.
<ETX> 1 <03>
[LRC] 1 Checksum
Message flow:
(Please refer to message Z50)