VT Display Template Builder – ISO 11783-6 Screen Designer

ISO 11783-6 specifies the Virtual Terminal (VT) protocol, which defines how electronic control units (ECUs) interact with a standardized human-machine interface (HMI) in ISOBUS-enabled machines. The VT Display Template Builder serves as a graphical development environment where engineers design screen hierarchies—including base screens, pop-ups, softkeys, and dynamic objects—while enforcing strict conformance to VT object types (e.g., VT Symbol, VT Rectangle, VT Text), state management rules, and memory constraints (e.g., maximum 65,535 objects, limited VT Object Pool size). The tool enforces semantic validation (e.g., correct parent-child relationships, valid object IDs, proper use of VT Object Attributes like 'Visible', 'Enabled', 'Value') and often includes simulation capabilities to test screen navigation, softkey behavior, and ECU-to-VT communication via simulated ECUs or CAN bus replay. It supports versioning, localization (via language-specific string tables), and integration with broader ISOBUS toolchains (e.g., AEF-certified test suites, CANoe/Vector tools). Ultimately, it bridges high-level UI requirements with low-level ISOBUS binary protocols—ensuring that third-party ECUs from different vendors behave predictably when connected to any ISO 11783-compliant VT.