---
type: entity
tags: [parking, hardware, printer, device]
sources: []
updated: 2026-06-14
---

# Rongta 80mm thermal printer

The chosen ticket/receipt printer: a **Rongta RP-series 80mm network thermal printer** (and the
many ESC/POS-compatible OEM clones that share its firmware). Driver `rongta` in
`packages/devices` implements [[device-adapter-pattern|PrinterDevice]].

## Transport & protocol

- **ESC/POS over a raw TCP socket on port 9100** (the JetDirect/RAW convention). The driver
  opens the socket, writes the ESC/POS byte stream, waits for flush, closes.
- **No authentication** on the print socket — anyone who can reach port 9100 can print. Like
  every other field device it must sit on the **isolated device VLAN** ([[network-isolation]]).
  There is no real HTTP/control boundary on the device (same posture as [[dingtian-relay]]).
- **Health check** is a TCP connect probe to 9100. The print socket exposes no status protocol
  we rely on; the print itself is the real reachability test (failover attempts the print).
- **Live status** comes from the device's own web page `http://<host>/prn_stat.htm` (port 80),
  which decodes Cover Open / Cutter Error / Paper End / Paper Near End / Off-Line into Yes/No.
  We scrape that rather than hand-decode `DLE EOT` — this clone's DLE EOT reply bytes do **not**
  match the canonical ESC/POS bit layout (verified on hardware), so trusting the device's own
  decode avoids a false-healthy. Implemented as `readStatus()`; see [[printer-status-monitoring]].

## Deployment (this site)

- First printer verified reachable at **10.0.10.6:9100** from the host (TCP connect OK,
  2026-06-14).
- **At least two printers**, by role — see [[printer-roles-failover]]:
  - **entry-dispenser** — outside, at the lane; the driver takes the entry ticket.
  - **booth-receipt** — inside the booth; receipts, AND the backup that prints the entry
    ticket if the outside dispenser is offline.

## Ticket rendering

`printTicket(TicketData)` builds ESC/POS: `ESC @` init, centered/bold/double-size header,
lane, ticket id, issued-at, feed + partial cut (`GS V B`). CP437/ASCII subset.

## Status

Driver written and compiles; entry-ticket layout is a first pass; live status monitoring is
implemented and verified ([[printer-status-monitoring]]). The receipt/exit layout and the
cash-drawer kick (ESC/POS `ESC p`) are **not yet implemented** — they arrive with the
exit/payment flow. Replaces the generic "Epson TM / Citizen" booth-printer line in [[bom]].