Hex 0x02 — Signals the beginning of a frame.
Open-circuit voltage typically ranges between 24VDC and 30VDC.
Third-party controllers interact with new Gilbarco dispensers using a cyclical state machine. The controller constantly loops through standard commands to maintain real-time forecourt visualization. A. The Status Poll (The Heartbeat) Hex 0x02 — Signals the beginning of a frame
The "Two-Wire" interface is a proprietary serial communication protocol developed by Gilbarco (now part of Vontier/Dover Fueling Solutions). It allows a single Forecourt Controller to manage multiple dispensers (pumps) over a daisy-chain or multi-drop cabling infrastructure.
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To connect a standard microcontroller or microprocessor (UART TTL/RS-232) to a Gilbarco current loop, third-party developers must use a specialized (Current Loop to Serial Converter) featuring high-speed optocouplers to isolate forecourt electrical noise from the control logic. 2. UART Serial Configuration
Integrating with the Gilbarco Two-Wire protocol offers a reliable method for third-party pump controllers to manage fuel dispensing. However, it requires strict adherence to the Master-Slave polling architecture and precise hardware interfacing (Current Loop conversion). Successful implementation relies on a robust software state machine capable of handling communication timeouts and adhering to local Weights and Measures regulations regarding transaction integrity. It allows a single Forecourt Controller to manage
The forecourt controller must act as the current loop master, providing the stable 45mA current.
Unlike modern RS-485 or Ethernet standards, the Gilbarco Two-Wire protocol uses a interface. Electrical Specifications
Standard twisted-pair cabling is used. It offers excellent noise immunity over long distances without shielding. Hardware Implementation Notes
: Uses a small number of characters to maintain high-speed communication between the controller and the pump. Hardware & Wiring Requirements