feat(devices): K200L printer driver — live cover/paper status from the J-Speed LAN board
The park-buzi printer is a K200L (Xprinter/ICS XP-K200L; its LAN board and USB descriptor call it "POS-80"). Its board serves the Rongta's five-row status table under /prt_status.htm — but the reply carries no HTTP status line or headers, which node:http rejects, so the Rongta driver could never read it and the unit was filed in July as "no status page → generic driver" (reachability only). New `k200l` driver (printer-k200l.ts): prints through the generic ESC/POS device (same bytes, TCP 9100 or usblp) and reads the page over a raw socket, tolerant of both the headerless and a proper HTTP reply. Mapping mirrors the Rongta: board unreachable → offline; page not understood → degraded, never ready; any fault → degraded naming it; USB → reachability floor. The Rongta driver is untouched. Tests replay the captured headerless page (devices suite 76). Live against the lab unit: ready; with the cover open the board reports cover open, paper out, off-line. Wiki: new k200l-printer entity (names, network setup from factory 192.168.123.100, board quirks, status page, what it means for park-buzi — over USB the app never saw cover/paper state at all), cross-links on the Rongta, status-monitoring, USB-transport and WSL-networking pages (parking-net pinned to eth1 while the LAN NIC is eth0), index. Claude-Session: https://claude.ai/code/session_01FWncR69HgGPuei1dLrW3cU
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---
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type: entity
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tags: [parking, hardware, printer, escpos, network, usb, status]
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sources: []
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updated: 2026-09-09
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---
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# K200L thermal printer (Xprinter / ICS "XP-K200L") — the park-buzi unit
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An 80 mm ESC/POS receipt printer, **USB + LAN**, sold under several names. Bottom label:
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*"THERMAL RECEIPT PRINTER — Model: K200L — Paper Width: 80mm — Print Speed: 200mm/s — Power
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Input: 24V 2.5A — Cash Drawer: 24V 1A — Interface: USB+LAN — Command Support: ESC/POS"*, serial
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`BLU2107080238`. Identified on the dev bench 2026-09-09; **it is the printer that "goes offline
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after a paper reload" at park-buzi** ([[printer-usb-transport]] §Field bug). The lab's older
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"ICS XP-K200L" (10.0.10.11, the 2026-07 USB truncation work) is the same family.
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Three names for one device, all seen on the bench:
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| Where | What it calls itself |
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| --- | --- |
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| bottom label | K200L |
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| USB descriptor (`lsusb`) | `1fc9:2016 NXP Semiconductors Printer-80` / "Printer POS-80" (0x1fc9 = the NXP controller chip; no brand) |
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| LAN board web UI | "J-Speed Ethernet Interface Module", "Ethernet WebConfig Version 1.02", copyright "POS" |
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The app driver is **`k200l`** ("K200L 80mm thermal printer (Xprinter / ICS, USB+LAN)",
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`packages/devices/src/drivers/printer-k200l.ts`). It prints through the shared generic ESC/POS
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path (identical bytes, TCP 9100 or `usblp`) and **adds live status from the LAN board** — see
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below. Before 2026-09-09 this unit ran on the generic `escpos` driver (reachability only), which is
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why the app could never show its cover/paper state.
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## Network setup (the evening that was never written down)
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- **Factory address `192.168.123.100/24`, DHCP OFF.** Nothing announces it; the printer just sits
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there on a subnet nobody uses. To reach it, give the workstation a second address in
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`192.168.123.0/24` (Windows: adapter → IPv4 → Advanced → add `192.168.123.101`), then open
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`http://192.168.123.100/`.
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- The web configurator (port 80, **no authentication**) is a three-frame page: *Information*
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(`ip_info.htm`: MAC, IP, mask, gateway, DHCP on/off, DHCP timeout), *Configuration*
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(`ip_config.htm`: DHCP client on/off + timeout, fixed IP / mask / gateway as four octet fields,
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**Save**, Restore Default, cancel), *Printer Status* (`prt_status.htm`), *Printer Test*
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(`prt_test.htm`), and a **Restart** button in the menu.
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- **Set a fixed address on the device VLAN** (park-lab: `10.0.10.7/24`, gateway `10.0.10.1`) →
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Save → Restart; then remove the temporary `192.168.123.x` address from the workstation. Keep
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DHCP off — the app addresses printers by IP ([[rongta-printer]] §Deployment).
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- The self-test page (`prt_test.htm` / the "Print Test Page" button on the status page) prints
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the current network settings, so a unit with a forgotten address can be read back that way.
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- The board's HTTP server is **tiny**: the frameset reloads its frames every 1–3 s and the status
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page every 5 s, and it holds very few connections. **Close the browser tab while the app is
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polling**, or connections intermittently time out (seen on the bench: `ping` fine, port open,
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every second HTTP connect hanging while the page was open in a browser).
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> **WSL gotcha while doing this (2026-09-09):** the dev box then carried BOTH `192.168.123.101`
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> and `10.0.10.203` on `eth0`, and WSL sourced 10.0.10.x traffic from the 192.168.123 address —
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> the exact [[wsl-dev-networking]] source-address bug, except `parking-net.service` pins `eth1`
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> and the mirrored LAN NIC is `eth0` now. Symptom: `ping` works, `curl` times out. Run the fix for
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> `eth0`, or drop the temporary address once the printer is moved.
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## Live status — the `/prt_status.htm` page
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The LAN board serves a five-row table the printer has already decoded from its own sensors:
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```
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Cover Is Open Yes/No
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Cutter Error Yes/No
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Paper End Yes/No
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Paper Near End Yes/No
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Printer Off-Line Yes/No
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```
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**Same rows, same `<TD>label</TD><TD>Yes|No</TD>` shape as the Rongta board's `/prn_stat.htm`**
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([[printer-status-monitoring]]) — only the path differs, which is why nobody found it in July
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(the Rongta driver looked for `/prn_stat.htm`, got nothing, and the unit was filed as "serves no
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status page → generic driver"). Verified on the bench: cover open → `Cover Is Open Yes`, `Paper End
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Yes`, `Printer Off-Line Yes` within a refresh; cover closed → all `No`.
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**Quirk that needs its own fetch code:** the board's HTTP reply has **no status line and no
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headers** — the body starts at byte 0 (HTTP/0.9 style). Browsers render it; `curl` reports
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`000` with an empty body; Node's `http` client rejects it with *"Parse Error: Expected HTTP/, RTSP/
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or ICE/"*. So the `k200l` driver reads the page over a **raw TCP socket** (`GET … HTTP/1.0`, read
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until the board closes) and accepts both the headerless reply and a proper one. This is the second
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reason the K200L has its own driver rather than a path option on the Rongta one.
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Status mapping (mirrors the Rongta driver, [[printer-status-monitoring]]): board unreachable /
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timeout → **offline**; page reachable but not the table (non-200, the index page) → **degraded
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"unexpected status page"**, never ready off a page we didn't read; any Yes → **degraded** naming
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the faults ("cover open, paper out, printer off-line"); all No → **ready**. Over **USB** there is
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no page: reachability floor only (ready/offline), same as a USB Rongta.
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## What this means for the park-buzi bug
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At park-buzi this unit ran **over USB** on the generic driver, i.e. monitored by "does
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`/dev/usb/lpN` open". A cover-open / paper-out condition **never showed in the app at all** — the
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badge stayed green. So the operators' "printer goes offline after reloading paper" was not the
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cover state being reported; it was a genuine probe failure whose errno is still unread (site shut
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down — [[printer-usb-transport]] §Field bug has the commands to pull first). Running the unit on
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**LAN with the `k200l` driver** would give the booth a real amber "cover open / paper out" while
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the roll is changed, and removes the `usblp` path from the equation altogether — a strong reason to
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cable it to the device VLAN when the site reopens.
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Related: [[rongta-printer]] · [[printer-status-monitoring]] · [[printer-usb-transport]] ·
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[[printer-roles-failover]] · [[network-isolation]] · [[wsl-dev-networking]] · [[site-device-installation]]
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@@ -2,7 +2,7 @@
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type: entity
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tags: [parking, hardware, printer, device]
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sources: []
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updated: 2026-06-19
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updated: 2026-09-09
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---
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# Rongta 80mm thermal printer
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@@ -55,6 +55,10 @@ many ESC/POS-compatible OEM clones that share its firmware). Driver `rongta` in
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- **booth-receipt** — `10.0.10.10`, inside the booth; receipts, AND the backup that prints
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the entry ticket if the outside dispenser is offline. This unit is a **Rongta** (`rongta`
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driver, full status-page monitoring).
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- **Not a Rongta, its own driver since 2026-09-09:** the **K200L** (Xprinter/ICS XP-K200L family;
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LAN board calls itself "POS-80") — the park-buzi unit and the lab's 10.0.10.11 unit. Same
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five-row status table under **`/prt_status.htm`** (not `/prn_stat.htm`), served without HTTP
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headers, so it has the `k200l` driver with a raw-socket fetch. See [[k200l-printer]].
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## Ticket rendering
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