tspl-corePure TSPL II protocol encoder

Directive byte builders and a status line splitter for any TSPL-speaking thermal label printer. Source-of-truth is TSC's TSPL II Programming Manual.

Get started

Wire protocol

Spec-aligned, no vendor extensions

Every byte sequence emitted is documented in TSC's TSPL II Programming Manual. Vendor add-ons (LZO BITMAP modes 3/4, ACK framing, vendor status keywords) live in driver packages that import this one.

Transport-unaware

Emits Uint8Array byte streams that callers feed to any transport — USB, Web Serial, BLE, TCP. tspl-core does not know about wires.

Universal runtime

One package, no node/web split. Uses only Uint8Array and TextEncoder/TextDecoder. Runs in Node, browsers, Deno, Bun, edge runtimes.

Source

This package is anchored on TSC's TSPL II Programming Manual — the canonical reference published by TSC. No vendor-app harvesting, no firmware reverse-engineering. Vendor extensions are out of scope and must live in driver packages downstream.