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NEO 2 Interface Developer’s Guide
Copyright © 2019, International Technologies & Systems Corporation. All rights reserved.
96
Name
Tag
Length
(Hex)
Value (Hex)
Application
Name
Exclude from
Processing
FFE8/DFEE53
01
04
APPLICATION
FFE2/DFEE4C
01
23
4.4.
2-byte tags vs. 3-byte tags
Some older versions of NEO firmware support the use of certain tags that are not compliant
with BER-TLV format (the non-compliant tags are 2-byte tags that begin with 'FF'). It is
possible to specify whether a device outputs old-style (illegal) tags or strictly compliant BER-
TLV tags (the latter are 3-byte tags that begin with 'DF'). Configuration tag DFEF3D (used in
conjunction with command 04-00) controls the output choice. A data value of 0x01 in this tag
forces the use of old/illegal tags, while 0x00 forces the use of the new 3-byte tags (which is
the default in VP5300, VP6300, and subsequent products).
Example:
To switch to NEW (BER-compliant) tags:
Command:
04 00
Data:
DF ED 11 01 00
Complete command:
56 69 56 4F 74 65 63 68 32 00 04 00 00 05 DF ED 11 01 00 32 E6
This feature only controls the
output
of old versus new tags (all tags are stored in the device,
internally, as the fully compliant BER-TLV tags). The configuration switch is mainly a
backwards-compatibility feature for customers who need to support the original, non-
compliant tags. If a user’s device outputs illegal (non-standard) 2-byte tags and they want it to
output the newer 3-byte tags shown below, set the DFEF3D configuration tag as described
above; if that doesn't work, update the firmware and try again.
Below is the list of old/illegal tags, and corresponding new 3-byte tags.
2-byte tag 3-byte tag Description
FFF0
DFEE67
Specific feature switch, used with Visa VCPS 2.1.1/2.1.2. It controls Visa CVN17
support and Track 1 & 2 data in the transaction response.
FFF1
DFEE34
Terminal contactless transaction limit, never used for PayPass.
FFF2
9F1E
Terminal IFD serial number.
FFF3
DFEE44
Application capability.
FFF4
DFEE35
Visa reader risk flags.
FFF5
DF8126
CVM required limit.
FFF7
DFEE7E
Enable/Disable Burst Mode:
Value = 00: Disable Burst Mode
Value = 01: Enable Burst Mode
Value = 02: Burst Mode auto exit; Burst Mode is turned off as soon as a
transaction command is received.