Gasboy 1000 Series FMS Card Encoding Manual - Manual (Page 29)

03/07/03 7-1
Section 7
ENCODING OPTICAL CARDS
Information is encoded onto the optical cards by using a special five-bit code. The code is unique
to GASBOY systems and adds to the security of the system.
The card is divided into a top and bottom section as shown in Figure 7-1 on the following page.
There is a maximum of 10 columns on each half of the card. Each column represents a digit of
information. If you card layout has 19 digits of information, your card will have 19 columns. Your
Card Layout shows the columns on your card and the digits with which they correspond.
There are five hole or bit positions for each column. Each hole position in a column has a
designated bit number from 1-5 as shown in Figure 7-1. A column's digit value is represented by
two bits or holes. Table 7-1 translates the decimal numbers (0-9) into two bits (holes) punched.
Therefore, for each digit of information encoded on your card, there will be a column with two
holes punched.
When using dual cards, the encoded information is separated onto two cards. For example,
employee information may be on one card, and vehicle information on another card. If a 4-digit
employee number is represented by columns 9-12, then on the vehicle card all five holes are
punched for each of these columns. When the two cards are placed on top of each other and
inserted into the system, the only holes appearing through both cards in columns 9-12 will be the
holes punched in the employee card representing the employee number.