0x03 — Signals the end of the data payload.
[Idle / Polling] ──> [Authorize] ──> [Fueling / Status Updates] ──> [Final Transaction Data] 1. Device Discovery and Polling
Active/Passive Current Loop (typically 45mA or 20mA systems). Logical State Representation: Mark (Logic 1): Current flowing (Loop closed). Space (Logic 0): No current flowing (Loop open). 0x03 — Signals the end of the data payload
Historically standardized at 57600 baud , though legacy configurations may operate at 4800 or 9600 baud .
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Before software development begins, the physical interface must be correctly established.
+-----------+ | IDLE | <------------------------------------+ +-----------+ | | | | (Customer lifts nozzle / Nozzle Switch) | v | +-----------+ | | REQUESTING| | +-----------+ | | | | (Controller sends AUTHORIZE command) | v | +-----------+ | | FUELING | | +-----------+ | | | | (Customer replaces nozzle / Limit reached) | v | +-----------+ | | FINISHED | -------------------------------------+ +-----------+ (Controller pulls data & clears transaction) State Sequence Details 4-20mA Comunications | Page 3 - All About Circuits Forum Data Format : 8 data bits
Third-party controllers rarely connect directly to the raw current loop. Instead, they interface via a or an isolation card. The D-Box translates standard RS-232, RS-485, or USB signals from your controller into the high-voltage/current-loop physical signals required by the dispenser's electronic head. 2. Protocol Architecture: Master-Slave Polling
Two-wire protocol traditionally only controls one product per hose. For blender units (Encore 700), you need extended commands.
: Known as the "corporate baud rate," used for models like Highline-111, Euroline, and Euro Dimension. 4800 bit/sec : Used for older models like Highline-2 and Euroline. Data Format : 8 data bits, Even parity , and 1 stop bit. Logical Interface