Gasboy CFN III Manager Manual V3.6 - Manual (Page 124)

Proprietary Cards How to Restrict Purchases
Page 13-2 MDE-4871 CFN III Manager’s Manual for Windows® XP Embedded - Version 3.6 · August 2010
How to Restrict Purchases
There are three ways you can restrict the fuel and merchandise that can be purchased on your
Proprietary Cards that conform to the standard Gasboy format; you may assign authorization
codes, limitation codes, and/or cumulative limits to the cards.
• Authorization codes determine the types of fuel and merchandise a card can access.
• Limitation codes determine how much fuel can be purchased on the card in a single
transaction.
• Cumulative limits are explained in “Fuel Allocation and Miles-per-Gallon” on page 15-1 .
Lockouts
There are two types of lockout available for the CFN system, bit-mapped lockout and limited
lockout. In addition, either type of lockout may be set up as a positive or negative system. The
type of lockout used is determined by the Site Controller configuration.
Bit-mapped lockout is used with Proprietary Cards. Limited lockout can be used with
Proprietary Cards and bank cards.
A typical format for the customer information field of privately issued cards is
ccccccvvvveeee where
• cccccc is the card number (a six digit number can lock out up to 999,999 cards; a five-digit
number can lock out up to 99,999 cards)
• vvvv is the vehicle number
• eeee is the employee number, and
• ccccccvvvveeee is the account number. Account number here refers to the entire
customer-information field of the Proprietary Card. This field is usually divided into
subfields that may include a card number, vehicle number, employee number, customer
account number, or other fields. Although it may seem confusing to call the entire field the
account number, when it can contain a subfield called account number, this terminology
conforms with the track II standard as defined by the American Bankers Association
(cards have three tracks and CFN card readers read track II).
With bit-mapped lockout, only the card number (six digits in this example) is used for lockout.
With limited lockout, the entire customer information field (14 digits in this example) must be
entered for lockout.
An offset can now be set in SYS_PAR to determine what card data is used. Refer to
MDE-4773 CFN III Configuration Manual for Windows XP for more information.
Bit-mapped Lockout
Bit-mapped lockout uses less memory than limited lockout, but is less flexible.
In a system that uses bit-mapped lockout, the card number is the configurable offset group of
digits (4-8) of the section of the card that identifies the customer. The number of digits used is
configured in SYS_PAR.