User's Manual

PIN Pad 791 Programmer’s Manual (PCI POS-A) UDN PM0103-U Rev. 06
Section 6 – Contact EMV Level 2 transaction messages 2015-04-20
Page113
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message T2A Response of Get Reversal Data message
Format: <STX>T2A[record of Reversal data]<ETX>[LRC]
Message length: var.
Usage: Return reversal data to terminal..
Message element:
Field Length Value and description
<STX> 1 <02>
T2A 3 Message ID
Reversal data Var. Hex string.
Optional, if this transaction needs a reversal.
<ETX> 1 <03>
[LRC] 1 Checksum
Reversal data:
According to the tag list of reversal data (refer to Appendix D), PIN pad will search the corresponding
values according to the tag list and return it as transaction record.
[EMV Tag Number (1 ~ 4 byte)] || [Length (1byte)] || [Value] || [EMV Tag Number (1 ~ 4 byte)] || [Length
(1byte)] || [Value] || …[EMV Tag Number (1 ~ 4 byte)] || [Length (1byte)] || [Value]. PIN pad can return at
most 256 bytes of data as one record, the right part of data will be ignored if the length record is greater
than 256 byte.
PIN pad will unpack the binary data into hex string and return to terminal. For example, the data of one
record is 0x9F02 || 06 || 000000001100 || 5A || 10 || 11223344556677889900AABBC
CDDEEFF, terminal will see “9F02060000000011005A1011223344556677889900AABBCCDDEEFF”
in [Batch data] field.
Message flow: Please refer to message T29