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
Page215
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Z2 / Z3 Authenticated mode with fixed prompt
To enable message Z42 and Z50, user has to issue Z2 / Z3 message with a prompt ID supported by PIN
pad (See Appendix H). These prompts are verified during Payment Card Industry (PCI) Security
Conformance tests to make sure users will not expose sensitive information (such as PIN) accidentally.
For security reason, to issue authenticated frame of Z2 / Z3 at the first time, the <SUB> flag is mandatory.
After Z2 authenticated mode entered, PIN pad will accept two kind of Z2 packet:
1. Z2 packet in normal mode, without <SUB> flag, and contains only digits (0~9)
2. Z2 packet in authenticated mode, without <SUB> flag.
For example, issue Z2<GS>005<SUB> and Z2<GS>016 will show “PLEASE ENTER DRIVER LICENSE”
on the screen.
Z2 / Z3 PIN entry mode with fixed prompt
To enable Z60, user has to issue Z2 / Z3 message with a prompt ID supported by PIN pad, dedicated for
PIN entry (See Appendix I). These prompts are verified during Payment Card Industry (PCI) Security
Conformance tests to make sure users will not misunderstand PIN entry request as other non-sensitive
data. Also message Z62’s prompt1 and prompt2 will be checked to see if they are listed in this prompt
table. If not, PIN pad will reject Z62.
Any other messages other than Z2, Z3, Z42, Z50, and Z60 or any unsuccessful Z2 / Z3 messages (wrong
prompt ID, format error, Z2 message includes non decimal characters) will make PIN pad to leave Z2 / Z3
authenticated mode to avoid attack.