Gasboy CFN III Config Mnl V3.4 - Manual (Page 43)

MDE-4316C CFN Series CFN III Configuration Manual for Windows NT® · April 2007 Page 37
Table Sizes
4 – Table Sizes
Use the disk-based configuration program TABLE to change the sizes of the 28 Site
Controller data or memory tables.
Tables are areas of RAM memory reserved for storing particular types of data. The Table
program allocates the available memory among the 28 tables, each of which is used by
particular devices and functions, such as sign on, taxes, mpg, pumps, and so on.
How much memory you can allocate to a particular table depends on how much memory the
other 27 tables are taking up and, in some cases, on the maximum number of a particular type
of device (such as island card reader or gate controller) you can have, based on memory
available at that point. Allocating sizes to tables is a trade-off: if you make some tables very
large, you must make others very small.
The Table menu displays the number of entries you have designated for each table. Each entry
in a table is called a record. Records for different types of tables take up different numbers of
bytes of memory. The formulas for calculating the number of bytes are given below, under the
description of each type of table.
The menu also displays, in bytes, the space remaining in memory for all Site Controller tables.
If the memory limit is exceeded, the menu displays a negative number. If you try to quit the
TABLE program when the memory limit is exceeded, you will see the message Cannot leave
with space remaining. You must change the table sizes until space remaining is greater than or
equal to 0 before the program will let you exit.
Double Entries
Seven tables - island card reader, gate controller, SDI, tank monitor system (gauge), console,
Fuel Point reader, and tank-have an extra entry in the menu. The number on the left is the total
possible number of that type of device that may be installed at the site, now or in the future.
The number on the right is the number of that type of device that is actually installed now.
The total number of entries (the number on the left) reserves table space for future expansion.
If it is likely that more devices will be added, the number of entries should be equal to the total
number of items that might be installed in the future.
For each of island card reader, gate controller, gauge, console, SDI, Fuel Point reader, or tank
set the number in use (the number on the right) equal to the number of devices of the given
type currently installed. If you enter a number larger than the number on the left, the prompt
will remain on the screen and the change will not be entered.
Only possible entries decrease the number of bytes available. Used entries do not take up any
additional bytes.