18 Dover Fueling Solutions W2940305 Rev 07 8/2019
3.3.3.1 Pulse Output
Pulse outputs transmit a DC output to communicate the quantity dispensed to a fuel control
system. The pulse ratio is set in the software configuration (e.g. 100:1 ratio provides 100
pulses per every gallon dispensed).
Basic features of the pulse output include:
Two (2) separate channels (channel X and channel Y) are provided for each hose
o Two (2) separate channels allow connection to both a fuel control system as well as a
tank monitoring system for continuous reconciliation
Each channel provides an isolated, open collector output
Each channel can handle up to 24 volts DC and 75 milliamps DC
Pulses for each channel are in sync with each other
The ground for each channel is provided by the fuel control/monitoring system
NOTE: Pull-up resistors are recommended on the pulse output lines because they are open
collector circuits. Pull-up resistors are not provided with the dispenser and should be
sized according to the voltage and load required by the control/monitor device.
The terminology used in the pulse output interface wiring diagram is defined below:
3.3.3.2 AC Authorization Input (AUTH)
The authorization input signal allows a fuel control system to control the dispenser operation.
When the software configuration is set for this mode of operation, power must be supplied to
this line in order for the dispenser to be able to reset and turn on when the dispenser nozzle
hook is lifted to “on.” When power is removed from this input, the dispenser transaction will
terminate even if the nozzle hook is still in the on position. Some Fuel Management Systems
use solid state relays which can supply a low level voltage while in the “Off” position. In some
cases, the voltage can be high enough to cause false tripping of the Auth Input. Always
verify that any voltage present on this line during the “Off” position is not sufficient to turn on
the Auth relay or to cause it to chatter. If such a condition does exist, contact the supplier of
the Fuel Management System because an additional load may need to be placed across the
Auth Input to reduce the voltage.
Some fuel control systems, that utilize solid state relays, may require the use of a load (like a
“bleed” resistor) to keep the output voltage of the system relay to a voltage level that will not be
sensed by the dispenser. If not used, this can result in “chatter” on the dispenser relays.
Consult the manufacturer of the fuel control system for information on how to load the system
relay outputs.
Basic features of the authorization input include:
Two (2) separate inputs; one (1) for each side (hose)
Voltage 120VAC or 240 VAC (optional); typical current requirement is 170 milliamps at
120 VAC and 55 milliamps at 240 VAC
Neutral line is provided for reference, but the dispenser and control system should be
powered from the same breaker panel so they use a common neutral reference
3.3.3.3 Reset Output (RESET)
The reset output signal communicates the dispenser operating status to a fuel control
system. After the dispenser is authorized and the nozzle hook is lifted to the on position, the
register resets and power is supplied on the reset output line to indicate the dispenser is reset
and ready to dispense product. Voltage will remain on this line until the nozzle hook is
returned to the off position or the voltage is removed from the authorization input. Some Fuel
Management Systems cannot sense voltage and sense current for the reset output (e.g.
OPW PetroVend K800, PetroVend System2). Check the installation requirements of the fuel
management system to determine if they require, and supply, additional components such as
WARNING
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