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For custom applications, off-the-shelf interface modules bridge a modern host system to the Two-Wire world. The Levtech LSP-FCG interface is a USB-powered current loop interface that provides a Virtual Serial COM Port to any PC or microcomputer, such as a Raspberry Pi. It features 4 dispenser ports with LED indicators for link and activity, and its galvanic isolation protects the host system from electrical surges.
Never initiates communication. It only responds when it detects its unique node address in a command frame sent by the master.
Use high-speed optocouplers (like the 6N137) to isolate the RX and TX channels. This prevents forecourt electrical noise from resetting your CPU.
The Gilbarco Two-Wire interface relies on a current loop architecture rather than standard voltage-driven serial communication like RS-232 or RS-485. Current loop (active/passive pairing). Never initiates communication
Pulses are registering; fuel is actively dispensing.
The Gilbarco TwoWire (also called Two‑Wire Multiplex or TW) protocol is a low‑level serial communication protocol used between a dispenser controller (pump head) and a point‑of‑sale / site controller or third‑party pump controller. It carries commands and status for fuel selection, nozzle status, dispenser electronics, price/volume totals, authorizations, and misc. device diagnostics over a two‑wire physical link.
Are you targeting specific dispenser models like the series? This prevents forecourt electrical noise from resetting your
For fuel retailers, integrating third-party systems with forecourt equipment can often feel like navigating a maze of proprietary barriers. However, the stands as one of the most enduring solutions for enabling third-party control over fuel dispensers. Officially named the "Gilbarco Dispenser Two-Wire Protocol for Third-Party Pump Controllers," this technology has served as a bridge between open innovation and proven hardware for decades, and it continues to evolve to meet the demands of modern fueling stations.
When engineering a custom embedded system (e.g., using an STM32 MCU, ESP32, or industrial PC) to communicate via the Gilbarco protocol, standard RS-232/RS-485 transceiver ICs will not work natively. Hardware Interface Requirements
The is the global backbone of fuel retail automation. For decades, this proprietary, current-loop communication standard has connected Gilbarco Veeder-Root fuel dispensers to Point of Sale (POS) systems, forecourt controllers, and third-party site automation hardware. the forecourt controller (FCC)
Introduction to Gilbarco Two-Wire Communication Fuel retail automation relies on stable communication between the Point of Sale (POS) system, the forecourt controller (FCC), and the fuel dispensers. Gilbarco Veeder-Root uses a proprietary current-loop signaling system known as the .
The Ultimate Guide to the Gilbarco Two-Wire Protocol for Third-Party Integration
