Gilbarco Dispenser Twowire Protocol For Third Party Pump Controllers New Patched [2026 Release]

To prevent equipment damage, third-party interfaces must use optical isolation between the dispenser data lines and the controller. Active vs. Passive:

The (often referred to as "Type A" or "Current Loop") is a legacy serial communication standard used to control fuel dispensers. For third-party pump controllers (non-Gilbarco POS), this protocol allows basic fuel authorization, grade selection, and transaction monitoring without requiring a full Gilbarco G-SITE or Passport controller. To prevent equipment damage, third-party interfaces must use

Several cloud-based controllers (e.g., PDI’s FueLink, Kalibrate Edge) now offer two-wire via an IoT gateway that uses an on-board current-loop interface. To prevent equipment damage

Unlike pure relay-based systems, the Two-Wire Protocol allows the controller to detect specific states (running vs. stopped) and volume delivery in real-time, enabling better inventory management and leak detection monitoring. this protocol allows basic fuel authorization