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

Page204

Uniform Industrial Corp. Proprietary and Confidential Total 342 pages

Message 71 Encrypted PIN Block Response

Format: <STX>71.<fkey flag><PIN length>01[PIN][LRC] (PIN block frame)

<STX>71[error code]<ETX>[LRC] (Error code frame)

Message length: Fixed 27 bytes for PIN block frame, 6 bytes for error code frame.

Usage: Send the entered PIN to HOST in encrypted format.

Message element:

Field Length

Value and description

71 2 Message ID

. 1 <2E> delimiter

[Fkey flag] 1 Always ‘0’ (This field is kept to retain old

model compatibility.)

[PIN length] 2 00, 04..12 length of PIN entered

01 2 01 format of PIN block, always 01

[PIN] 16 Encrypted PIN blocks

Format: hexadecimal string.

[LRC] 1 Checksum

Message 71 (Error message)

Field Length

Value and description

71 2 Message ID

[Error code] 1 Code to indicate error (see next page)

[LRC] 1 Checksum