Gasboy 1000 Series Technical Reference Manual - Manual (Page 28)

GASBOY Series 1000
2-10 03/07/03
Mag Cards For dual Mag cards, a different check digit may be encoded on each card. This
allows the check digit to relate to the card on which it is encoded. For example,
the odometer check digit is usually associated with the vehicle card, whereas the
PIN check digit is usually associated with the employee card.
Optical Cards For dual optical cards, a check digit is encoded on only one card, typically the
vehicle card. On the other card, all of the holes are punched in the Check Digit
position.
CFN Network For dual CFN Network cards, the check digit must be the same on both cards.
"A" System Additional entries (PIN, odometer, or manual entry) in an "A" System can be
mandatory or regulated by a check digit. Mandatory entries must be specified at
the time of order. If entries are regulated by a check digit, up to three different
check digits may appear: PIN, odometer, and manual entry. A check digit is a
digit on the card that indicates whether the user must make additional entries
upon fueling. The check digits may be in any position on the card and each may
contain a value of either 0 or 1, with 0=not required, and 1=required.