The Two-Wire protocol is compared to modern D-box or Ethernet. New third-party controllers should implement the following command set:
The Gilbarco dispenser two-wire protocol is a communication standard used for integrating third-party pump controllers with Gilbarco dispensers. This protocol enables seamless communication between the pump controller and the dispenser, allowing for efficient and accurate fueling operations. In this write-up, we will explore the details of the Gilbarco dispenser two-wire protocol and its significance for third-party pump controllers.
: Sending specific volume or currency limits to the dispenser before fueling begins. Status Monitoring The Two-Wire protocol is compared to modern D-box
*Disclaimer: This document is for informational purposes
⚠️ The third-party controller must have an active 20mA current loop interface . If your controller only provides RS-232, you must install an isolated 20mA converter (e.g., B&B Electronics 232LPTTL or equivalent). In this write-up, we will explore the details
A third-party controller must implement the following command sets:
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. If your controller only provides RS-232, you must
Final volume, total price, and unit price.
For third-party integration, the protocol requires specific communication parameters and physical wiring:
At its core, the Two-Wire Protocol is a communication standard. Unlike modern voltage-based standards like RS-232 or RS-422, a current loop transmits data by modulating the current flowing through a simple pair of copper wires.
For sites upgrading from legacy mechanical dispensers to modern electronics, the Two-Wire Protocol often allows the reuse of existing copper infrastructure. This significantly reduces trenching and conduit labor costs.