Gilbarco Dispenser Twowire Protocol For Third Party Pump Controllers New Portable Now

This document outlines the specifications for third-party controller integrations.

This technical guide provides a deep-dive analysis of the Gilbarco Two-Wire protocol, specifically tailored for engineers and developers building new third-party pump controllers. 1. Physical Layer and Electrical Specifications

5. Challenges and Best Practices for Third-Party Engineering

Disclaimer: Implementation of fuel dispensing equipment requires specialized knowledge. Always refer to the official Gilbarco technical manuals and the documentation of the third-party controller manufacturer. *If you'd like, I can: Physical Layer and Electrical Specifications 5

The baud rate is model-dependent, which is a common stumbling block for new implementations:

The Gilbarco Two-Wire Protocol remains a reliable method for connecting dispensers in fuel retail, even with the rise of newer protocols. Integrating this protocol into new third-party pump controllers offers station owners a versatile and cost-effective approach to site management. By focusing on proper wiring, robust polling strategies, and accurate protocol interpretation, developers can ensure seamless operation.

The PPC must be capable of:

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 .

A third-party controller manages the dispenser by constantly looping through specific operational states.

| Command | Function | Typical Use | | :--- | :--- | :--- | | <SOH>01<Grade> | Authorize sale | Pre-auth for dollar/volume limit | | <SOH>02 | Price request | Poll current fuel price per grade | | <SOH>06 | Sale complete | End transaction, print receipt | | <SOH>07 | Reset/Pump off | Immediate stop flow | | <SOH>0R | Real-time status | Poll for sale volume, dollars, handle state | *If you'd like, I can: The baud rate

The LRC is calculated by performing an Exclusive OR (XOR) operation on all bytes following the SOH up to and including the ETX. Core State Machine and Polling Cycle

| 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 |