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NEO 2 Interface Developer’s Guide
Copyright © 2019, International Technologies & Systems Corporation. All rights reserved.
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You can use the top bit of the first byte of DFEF4B to control search behavior: If the bit is ON,
all data elements requested will be provided (if they exist). If the bit is OFF, only the first
element found will be retrieved and placed in DFEF4D.
If you request multiple data items, they will be concatenated. To know the original lengths of
the items, you must retrieve and inspect Tag DFEF4C (see below).
To use tag DFEF4B, add it (as a TLV) to your terminal configuration settings. Use
Contact Set Terminal Data (60-06)
to send the settings to your device
as you normally would.
NOTE:
If this tag does not exist in Terminal Settings, tags DFEF4C and DFEF4D will not be
generated.
The default value of this tag is 0x12 (Track 2 enabled, with Sentinels).
Data Search Order
When
"Only First Element Found" (bit 8 = 1)
is set in DFEF4B, Tag DFEF4D will be populated
with a single data element according to the following search order
Track 2, Tag 57 (converted to alpha numeric format)
Track 2, Tag 9F6B
Track 2, Tag 5F22
Track 1, Tag 56
Track 1, Tag 5F21
PAN, Tag 5A (converted to alpha numeric format)
Track 3, Tag 58
Track 3, Tag 5F23
Regardless of the original format, the data will be placed in the DFEF4D tag in alpha numeric
format, such that after decryption (and with padding removed) the data will look similar to:
3b343736313733393030313031303031303d3135313232303131313433383738303839
3f
Which means that after rendering it as ASCII, it would look like:
;4761739001010010=15122011143878089?
When
"All Data Elements Found" (BIT 8),
is specified in DFEF4B, Tag DFEF4D will be
populated with a single instance of each requested data element, according to the following
order: