Gilbarco Dispenser Twowire Protocol For Third Party Pump Controllers New

The Gilbarco Two-Wire protocol is a proprietary, multi-drop current loop communication standard used to link fuel dispensers with point-of-sale (POS) systems or third-party pump controllers. It operates as a master-slave system where the controller (master) initiates all communication, and individual dispensers (slaves) respond only when addressed. 1. Technical Specifications

To integrate a third-party controller, the system must handle both the physical signal conversion and the software logic: The Gilbarco Two-Wire protocol is a proprietary, multi-drop

Competitive pricing on controller hardware.
Easier sourcing of replacement parts.
Simplified maintenance training for technicians.

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Flow Validation: The controller must differentiate between valid pulses (fuel flow) and switch noise.
Safety Logic: If the two-wire loop is broken (wire cut or disconnect), the system must default to a "Disabled/Safe" state, preventing unauthorized fueling.

Receive comparator (detect current from dispenser’s response).

Galvanic isolation – dispensers are often on different grounds; common-mode voltage can exceed ±12V.

Overvoltage protection (±60V transient) – pump motors and relays induce spikes.

8. Recommendation for New Third-Party Implementations

If you are developing a new third-party pump controller today: Competitive pricing on controller hardware