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Section 21
PUMP SWITCH TIMER OPTION
DESCRIPTION
The Pump Switch Timer option allows you to prevent fueling at a pump when the handle has been
left on from a previous transaction.
In a normal transaction when you request a pump, the pump is activated, the user turns on the
pump handle and fueling begins. Occasionally, the pump handle may have been left on from a
previous transaction. When a new transaction is initiated, the pump cannot reset and, if pumping
is allowed, the quantity shown at the pump includes the previous transaction quantity.
With the pump switch timer option, the handle is checked at the beginning of each transaction. If it
is found to be on, the user will see the message TURN OFF PUMP HANDLE and the transaction
will be terminated. A transaction will be generated with the message PMP SW ERROR. The user
must turn off the pump handle and begin a new transaction in order to fuel.
In order to use this option, you must set a time period during which the pump is checked. This
time period must be less than the time that it takes for your pump to reset and transmit a switch
detect signal back to the fuel management system. Nearly all pumps take more than one second
to reset and transmit switch detect, so the values for this option range from .1 to 1 second, in
tenths of a second, with .5 being a commonly used value. This value may need to be adjusted for
your pumps. A setting of zero disables this option.
When you have the pump switch timer option, the SC command provides a prompt for you to enter
this time period. Values to enter are 0 to 10, with zero being disable, 1 being one-tenth of a
second, 2 being two-tenths of a second and so on up to 10 which is one second) These values
can be loaded only when the pulse rate change switch on the MPU board is enabled.
05/29/03
21-1
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