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Fuel Control System Manager's
User's Guide
SYSTEM OVERVIEW
1.4.2.3 PERSONAL IDENTIFICATION NUMBER (P.I.N.)
Personal Identification Number is an optional feature designed to increase the security of the Fuel Control
System. This is a four digit number designated by Computrol, produced in the software and assigned by the
System Manager to all or specific drivers. In order to start the fuelling process, drivers must present their
card(s) and enter their P.I.N.s using the keypad. As a further security feature, the entered P.I.N. is not
echoed on the PCU display; asterisks (*) appear instead. The driver has three chances to enter the correct
P.I.N. before the display reverts to "PRESENT CARD". A diagnostic transaction is also logged in the PCU
indicating an unsuccessful attempt to enter a P.I.N.
1.4.2.4 FUEL LIMITS
As an optional feature, cards can be limited as to the amount of fuel that can be dispensed from any pump
in one transaction. The System Manager assigns the fuel limit for individual cards by using the E(NABLE)
C(ARD) commands explained in Section 3. There are 16 different fuel limits which may be individually set
with the S(ET) L(IMITS) command, also explained in Section 3.
NOTES: 1.
2.
Pumps are also set with a fuel limit. The S(ET) P(UMP) feature limits the amount of fuel dispensed at
one filling. See Section 3 for explanation of this command.
If both cards and pumps have fuel limits, the PCU terminates the fuelling at whichever limit is the
lower. If the PCU terminates the fuelling because the card's fuel limit has been reached, it logs "TRN
LMT" for "Transaction Limit" under the "TERM" heading in the transaction reports.
If the reason for termination was that the pump limit was reached, the PCU logs "PMP LMT" for "Pump
Limit" under that heading.
1.4.2.5 ODOMETER ENTRY
This is an optional feature which requires all individual cardholders to enter their odometer reading, unit
number or other required number. This information then becomes part of the transaction data and reports. It
does not affect system operation except with regard to report interpretation.
1.4.2.6 ODOMETER VERIFICATION
This optional feature provides the System Manager with the ability to ensure the accuracy of the odometer
readings entered by the cardholders. Special software must be specified at the time of ordering. See
Section 2 for a detailed explanation and Section 3 for the commands associated with this option.
When implementing this feature, cards are assigned to each vehicle. Before fuelling a vehicle, the driver
will be required to enter a meter reading. The new meter reading is compared to the last one entered which
stored in the PCU's memory. If the new number is within a window of acceptability the transaction
proceeds normally. This window is called the variance and is represented by a variance code.
If the number is too high or low, the driver will be prompted to re-enter the number. After three attempts
the transaction may proceed but will be flagged as having an invalid odometer.
Computrol Fuel Systems Inc.
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