For decades, the fuel retail industry has operated in a state of semi-walled gardens. Major dispenser manufacturers, particularly Gilbarco Veeder-Root, developed proprietary communication protocols that made it notoriously difficult for third-party point-of-sale (POS) systems, fleet fueling managers, and automated tank gauge (ATG) integrators to communicate directly with the dispenser’s hydraulic components.
| Manufacturer | Product | Notes | |--------------|---------|-------| | FMS (Fuel Management Systems) | FMS 3000 | Fleet keypad, two-wire native | | Syntech Systems | FMS-PRO | Supports two-wire + RS-485 | | Raytec | RC-200 | Retrofit for car washes | | Wayne (Dover) | iX Pay | Limited two-wire legacy mode | | Verifone | Commander (with serial adapter) | Via Gilbarco’s “G-SITE” adapter | Unlocking the Forecourt: The New Era of Gilbarco
For third-party integration, the physical layer typically uses an optically isolated current loop, but the logic varies slightly by dispenser generation: Highline-2, Euroline, Euro Dimension : Operates at a baud rate of 4800 bit/sec Highline-III, Euroline, A.G. Walker : Uses the "Corporate baudrate" of 5787 bit/sec Common Data Format : 8 data bits, Even parity, 1 stop bit. : Multi-drop protocol supporting up to 16 fueling positions on a single communications loop. Third-Party Interface Solutions Third-Party Interface Solutions The Ultimate Guide to the
The Ultimate Guide to the Gilbarco Two-Wire Protocol for Third-Party Integration particularly Gilbarco Veeder-Root
Because most modern computers use USB or RS-232, you cannot connect directly to the pump's two-wire lines. You need a converter or interface board.