Developing a reliable Gilbarco-compatible controller presents several edge-case scenarios:
Third-party controller manufacturers utilize this protocol to:
: Controllers use specific "Special Function Commands" (SFC) to manage the pump. For instance: : The controller (e
Price changes must be pushed down the loop when the dispenser is strictly in an Idle state. Attempting to change prices during an active transaction or a pending call state will result in command rejection or communication desynchronization.
: The controller (e.g., your third-party system) acts as the "Master" and initiates all communication. Dispensers are "Terminals" (slaves) and only respond when addressed. Grade Selected: The active fueling product
Accumulated units (Gallons or Liters) measured via the pulser. Grade Selected: The active fueling product. 5. Developing Third-Party Hardware Controllers
Gilbarco requires a Distribution Box (D-Box) , such as the PA0242, to house the current loops and provide automatic isolation for each dispenser. Maximum wiring distance is typically 2,600 feet using 14 AWG wire. Key Considerations for New Controllers Gilbarco 2 Wire Protocol - mchip.net Maximum wiring distance is typically 2
Data is transmitted by switching the current on and off (Mark/Space).
The protocol is not standard RS-232. It utilizes a interface (typically 20mA or 40mA active/passive) or a proprietary differential signaling method.