: Known as the "Corporate baudrate," used by Highline-111, Euroline, Euro Dimension, and A.G. Walker models. 4800 bit/sec
For the last ten years, the common advice for third-party integrators was: "Install a Gilbarco Pass-Through box or replace the dispensers." That advice is now outdated. Several factors have converged to create a environment for third-party pump controllers using the two-wire protocol.
This is not the same as Gilbarco’s newer “Ethernet/EDH” (Encryption Device Handling) or “Passport” protocol. It is unencrypted , polled , and half-duplex .
The landscape of third-party dispenser control is evolving rapidly. Several major trends are set to redefine the industry in 2025 and 2026. : Known as the "Corporate baudrate," used by
Deploy the third-party controller initially in "passive monitoring mode" (sniffing existing loop traffic) before granting it active control over authorization and clearing loops on live forecourts.
⚠️ Using RS-232 or RS-485 transceivers directly – will damage the dispenser’s interface. You need a current-loop converter (e.g., B&B Electronics 232CL, or build with 4N35 optos).
⚠️ : Gilbarco is moving toward 2-wire Ethernet (GEM-Bus, FlexPay IV) and Wi-Fi (GVR) . For new third-party controllers, confirm the dispenser model supports Classic Two-Wire or requires a protocol converter (e.g., Gilbarco GVR-DC). Several factors have converged to create a environment
Ensure physical isolation via .
The 1200 baud timing is sensitive. Using a Linux userspace serial driver often fails due to scheduling latency. Use a dedicated microcontroller (STM32, PIC) or a real-time UART with 1% baud accuracy.
) to bridge to RS-232, RS-485, or USB for third-party controllers. Error Checking The landscape of third-party dispenser control is evolving
The most significant shift is from serial-based protocols to direct IP connectivity, with IFSF enabling true plug-and-play interoperability.
As payment security regulations tighten, the demand for encrypted, EMV-compliant communication channels has surged. Secure TLS 1.2 channels and standard encrypted pulsers are becoming mandatory.
Logic states are defined by current flow rather than voltage levels.
A single-byte address identifying the specific fueling point (usually mapped from 0x01 to 0x10 or modified with specific offsets depending on the software version).