The TD-4520TN differs from Brother's QL line: it is a thermal-transfer desktop model with printer-language emulations and Ethernet. The observed route used a ZPL-class stream, not the QL raster path.
Successful jobs for this exact reported model exist in LabelInn production telemetry. The connection, firmware, LabelInn version, and date were not captured unless stated below.
Production telemetry contains successful ZPL-route print jobs reported as Brother TD-4520TN; connection and active emulation were not captured.
What LabelInn supports
300 DPI 4-inch labels where Brother hardware must accept an established command stream. The TD-4520TN differs from Brother's QL line: it is a thermal-transfer desktop model with printer-language emulations and Ethernet. The observed route used a ZPL-class stream, not the QL raster path.
ZPL II (emulation), EPL2 (emulation), DPL (emulation) output at the selected resolution.
Direct command printing is supported when an available interface is selected.
Confirm that ZPL II emulation is active, render at 300 DPI, and use Ethernet for shared stations when available. Match ribbon and media mode.
Setup checklist
Confirm the complete model name, suffix, installed interface, and current command-language mode.
Set the page DPI and printable width to match the physical printhead.
Load the correct media; if applicable, match ribbon mode and sensor type.
Print a small calibration label before sending a production batch.
Operating-system notes
Windows — Supported
Use either the operating-system print path or direct protocol output when this record marks direct printing as supported.
macOS — Supported
Direct protocol output avoids a model-specific print driver when the selected connection is available to macOS.
Android — Conditional
Android support is conditional on a supported USB, Bluetooth, or network path; the production observation did not record which path was used.
Common configuration problems
Sending ZPL while another emulation is active produces errors or literal output.
Confusing TD-4520TN with similarly named non-TN models can lead to wrong interface assumptions.