Gilbarco Dispenser Twowire Protocol For Third Party Pump Controllers New -
This report is for educational and engineering planning purposes. Developers must obtain official technical documentation and interface specifications directly from Gilbarco/Vontier to ensure compatibility with specific hardware revisions.
Before software development begins, the physical interface must be correctly established.
: Minimum 18 AWG for runs up to 1000 feet; 14 AWG for runs up to 2600 feet. This report is for educational and engineering planning
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.
As the name suggests, communication occurs over a pair of wires (current loop) connecting the dispenser’s head controller to a pump controller or interface unit. : Minimum 18 AWG for runs up to
<SOH> 0 1 1 5 0 0 0 EOT
Dispensers act as passive current switches, modulating the loop current to transmit data back to the controller. Data Link Layer and Framing <SOH> 0 1 1 5 0 0 0
To correctly implement the Gilbarco two-wire protocol, your controller must:
| Parameter | Specification | | :--- | :--- | | | 20mA Current Loop (not RS-232 voltage levels) | | Topology | Daisy-chain (one pair of wires from controller to dispenser 1, then to dispenser 2, etc.) | | Wire Type | Twisted pair, shielded (Belden 8760 or equivalent) | | Max Distance | 2000 ft (600m) per loop | | Communication | Half-duplex, asynchronous | | Baud Rate | 1200 bps (fixed, non-configurable on most legacy dispensers) | | Data Format | 1 start bit, 7 data bits, even parity, 1 stop bit |
