Gasboy 9800Q Series - Manual (Page 34)

Control Lines
Page 4-6 MDE-4340A Series 9800Q Pumps and Dispensers Installation/Operation Manual · January 2006
Pulser
When the dispensing unit includes the optional pulser interface, a pulser output is provided.
This pulser output provides a DC output to indicate the quantity dispensed. The pulse rate can
be configured by a sealable DIP switch for rates of 1, 10, 100, 500 pulses per gallon or 1, 10,
or 100 pulses per liter. For the 9840Q pump, the pulse rates are 1, 10, 100, or 500 pulses per
gallon or 1, 10, or 100 pulses per liter. For the 9850Q pump, the pulse rates are 1, 10, and 100
per US Gallon, or 1 or 10 pulses per liter.
The output is an open collector transistor output capable of sinking up to 100 milliamps DC at
voltages up to 24 VDC. The DC ground for the circuit comes from the Fuel Management
System (FMS). Since the transistor switches between ground and high-impedence, the
installer must provide a voltage reference when the transistor is in the high-impedence state.
This reference voltage is provided by a pull-up resistor installed at the FMS between the pulser
input and the reference voltage. The value of this resistor is calculated based on the voltage
and current requirements of the FMS pulser circuit.
The J-Box used in the optional pulser interface contains four wires. Any unused wires in the
J-Box must be individually capped.
RS-485
When the dispensing unit includes the optional RS-485 interface, RS-485 lines are provided.
This interface allows the user to connect a Gasboy CFN Series System directly to the Series
9800Q dispensing unit. These lines must be individually capped when not in use. The RS-485
interface is included with the TopKAT option.
RS-232 and RS-422
When the dispensing unit includes the optional TopKAT, lines for communication to the
TopKAT are provided. These lines allow the user to communicate directly to the TopKAT via
RS-232 or RS-422. These lines must be capped when not in use.