Control Lines
Pulse Output
Page 22 MDE-4567D 9820K Series AST Pumps Installation and Operation Manual · January 2020
Pulse Output
The Pulse Output option provides a DC pulser output to indicate the quantity dispensed. This
is an open collector output. This output can sink up to 150 mA DC at voltages up to 24 VDC.
The pulse rate can be configured by a sealable DIP switch for rates of 1, 10, 100, 250 and 500
pulses per gallon (PPG) or 1, 10 and 100 pulses per liter (PPL). This output should only be
used when monitoring of the unit's operation is desired.
RS-485
When the pumping unit includes the optional RS-485 interface, RS-485 lines are provided.
This interface allows the user to connect a Gasboy Fuel Controllers using RS-485
Communications directly to the 9820K Series register’s electronics.