Gilbarco Dispenser — Twowire Protocol For Third Party Pump Controllers New
To connect a Gilbarco dispenser to a new third-party controller, specific hardware and software integration must take place. 1. The Interface Unit / Converter
| 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 |
The Gilbarco dispenser two-wire protocol supports various commands and responses, including:
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If you must implement Two-Wire on a new controller, strictly adhere to the 1200 baud, 20mA current loop, and daisy-chain topology described above. To connect a Gilbarco dispenser to a new
A third-party controller manages the dispenser by constantly looping through specific operational states.
The controller software must be programmed to interpret the specific timing and voltage levels associated with the Gilbarco Two-Wire standard.
Are you developing for a (like ESP32 or Arduino) or a PC-based system ?
can be used in "Pump Simulator" mode to test your software logic. 4. Implementation Best Practices RS-232 to Two-Wire Converter Box Kit I need to gather comprehensive information
Since the protocol is proprietary, third-party pump controllers often require specialized hardware interfaces to convert the current loop signal into standard serial (RS-232/RS-485) or USB formats. 4-20mA Comunications - All About Circuits Forum
The protocol follows a Master-Slave architecture. The third-party controller acts as the Master, and the dispensers act as Slaves. Communication is never initiated by the pump; it must wait to be polled.
The master (controller) initiates all communication, and the slave (dispenser) only replies. 2. Why Use Third-Party Pump Controllers?
⚠️ 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). search results have provided some useful information
Developing a reliable Gilbarco-compatible controller presents several edge-case scenarios:
Because the protocol is proprietary, official documentation such as "PROTOCOL REPORT - Volume I (TWO-IS-S1.0-5)" is the standard reference for implementation.
allow technicians to test pumps directly from a laptop without a full POS system. Levtech Service & Production or a list of compatible POS systems for a particular Gilbarco dispenser model?