Gilbarco Dispenser Twowire Protocol For Third Party Pump Controllers New __full__ Jun 2026

: Constantly polling the dispenser to determine the current state (e.g., Idle, Nozzle Lifted, Fueling, Transaction Complete). Data Retrieval

Any third-party controller connecting to physical dispensers must comply with local weights and measures (e.g., NCWM/NTEP in the United States, MID in Europe) and intrinsically safe design parameters if placed near the hazardous forecourt zones.

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Gilbarco Two-Wire Protocol is a proprietary communication standard used to connect Gilbarco fuel dispensers to Point of Sale (POS) systems and site controllers. For third-party developers, implementing this protocol is essential for controlling fueling transactions, managing presets, and retrieving real-time data from forecourt equipment. Technical Overview The protocol operates as a multi-drop current loop

+-----------+ | IDLE | <------------------------------------+ +-----------+ | | | | (Customer lifts nozzle / Nozzle Switch) | v | +-----------+ | | REQUESTING| | +-----------+ | | | | (Controller sends AUTHORIZE command) | v | +-----------+ | | FUELING | | +-----------+ | | | | (Customer replaces nozzle / Limit reached) | v | +-----------+ | | FINISHED | -------------------------------------+ +-----------+ (Controller pulls data & clears transaction) State Sequence Details 4-20mA Comunications | Page 3 - All About Circuits Forum This link or copies made by others cannot be deleted

| Issue | Resolution | | :--- | :--- | | | Check current loop polarity – swap A/B wires. | | Intermittent drops | Ensure total loop resistance < 500Ω. Add terminator (120Ω) only at last dispenser. | | Parity errors | Third-party controller must use Even parity – not none, odd, or mark/space. | | Handle drops | Dispenser requires polling every 100-200ms; long gaps cause auto-cancel. |

Dictating which fuel products are unlocked. Try again later

When connecting a new third-party controller to Gilbarco dispensers (models: Encore 300, 500, 700, or legacy E系列), follow the terminal mapping below:

<SOH> 0 1 0 0 <EOT> (Ready to lift nozzle)