diff --git a/wiki/concepts/entry-exit-readers.md b/wiki/concepts/entry-exit-readers.md
index 3d83211..27ee7c6 100644
--- a/wiki/concepts/entry-exit-readers.md
+++ b/wiki/concepts/entry-exit-readers.md
@@ -22,6 +22,12 @@ There are **two populations** of users, and they map to **two integration paths*
 | [[wiegand]] reader → UHPPOTE port | The controller | Controller (onboard card list) | **Yes** — works if host down |
 | Pure TCP/IP reader | Host only | Host, then UDP `open` to relay | No — host on critical path |
 | [[lpr-camera|LPR]] / QR scanner | Host only | Host | No |
+| **[[gee-qr-er80]] QR reader (serial)** | Host only | Host (reads serial → `read` bus) | No |
+
+> Concrete host-side reader on hand: the **[[gee-qr-er80]]** (QR over RS-232/RS-485). Note autonomy
+> is moot here anyway — the current relay ([[dingtian-relay]]) has **no onboard card list**, so even
+> a Wiegand reader would be host-decided. So we take the serial/QR path straight to the host's
+> `read` bus.
 
 ## Key points
 
diff --git a/wiki/concepts/ticket-encoding.md b/wiki/concepts/ticket-encoding.md
index 83c2020..e573285 100644
--- a/wiki/concepts/ticket-encoding.md
+++ b/wiki/concepts/ticket-encoding.md
@@ -37,6 +37,9 @@ must have:
 - The **scanner is a device behind an adapter** ([[device-adapter-pattern]]): a new `ReaderDevice`
   kind (QR/barcode imager) — likely the same `IdentitySource = "ticket"` / `"qr"` path. Keeps the
   app device-agnostic; hardware model is procurement ([[bom]], [[open-questions]]).
+  - **On hand:** the **[[gee-qr-er80]]** QR access reader (`-Q-W`: QR scanner, Wiegand/RS-232/RS-485,
+    Linux-supported) — the concrete scanner for this path. A serial `ReaderDevice` adapter feeds the
+    `read` bus; pending the reader's RS-232 frame/baud (see [[gee-qr-er80]] open questions).
 
 ## Ticketless alternative (plate as the ticket)
 
diff --git a/wiki/entities/gee-qr-er80.md b/wiki/entities/gee-qr-er80.md
new file mode 100644
index 0000000..03f68c8
--- /dev/null
+++ b/wiki/entities/gee-qr-er80.md
@@ -0,0 +1,59 @@
+---
+type: entity
+tags: [parking, hardware, readers, qr]
+sources: [gee-qr-er80]
+updated: 2026-06-16
+status: open
+---
+
+# GEE-QR-ER80 (QR access reader)
+
+The project's **QR-code reader** (GEE NFC LIMITED). A static optical scanner for **QR /
+DataMatrix / 1D barcode**, optional ID/IC card. This is the **[[ticket-encoding|QR ticket]]
+scanner** the design called for — read at the pay station and exit lane — and a path for **QR
+[[permit]]** credentials. On hand: variant **`-Q-W`** (QR scanner; Wiegand/RS-232/RS-485).
+(See [[gee-qr-er80|datasheet summary]] / `raw/`.)
+
+## What it is (and isn't)
+
+- **Optical, not RFID-prox.** Earlier we *assumed* "ER80-EM" = a 125 kHz EM4100 card reader — the
+  datasheet corrects that: it's a **QR/barcode scanner**. The `-EM` in the original label was a
+  mis-id; the real model is **GEE-QR-ER80**. Optional `D`/`C` variants add ID/IC card, but the unit
+  on hand is **QR-only** (`-Q`).
+- **Multi-interface** (Wiegand 26/34, RS-232, RS-485, USB, TCP/IP); the `-W` variant exposes
+  **Wiegand + RS-232/RS-485**.
+
+## How it fits our architecture — host-side reader
+
+It's a **host-side identity source** ([[entry-exit-readers]]): the host sees the scan, decides, and
+commands the relay — exactly the model the read-driven flows already use. A scan becomes a
+`DeviceReadEvent` on the internal `read` bus (`kind: "qr"`/`"ticket"`, value = the scanned string),
+consumed by the **exit flow** and the **QR-permit** path ([[parking-session]], [[permit]]) — both
+**already built**. So integration is a new **`ReaderDevice` adapter**, no business-logic change
+([[device-adapter-pattern]]).
+
+- **Interface choice:** prefer **RS-232/RS-485 (serial)** for the QR variant — Wiegand can't carry a
+  variable-length QR string well (it's built for fixed-width card IDs). The host reads scans over a
+  serial port (USB-serial on TX/RX, or the USB variant); no Wiegand-decode hardware needed. This
+  suits [[offline-first]] (local serial, no network) and sidesteps the [[dingtian-relay|Dingtian]]'s
+  lack of an onboard card list (we never wanted autonomy here anyway).
+- **LED/BEEP control lines** mean the host can drive scan feedback (accepted/rejected) — nice for an
+  unmanned lane.
+- **Linux-supported**, 4–15 VDC — fits the [[disk-os-hardening|appliance]].
+
+## Open questions (block the adapter)
+
+1. **RS-232/RS-485 protocol:** baud rate + frame format, and confirm a QR scan emits as an **ASCII
+   string** (expected) terminated by CR/LF vs. a framed/checksummed protocol. This is the one fact
+   the adapter needs and the datasheet omits. Resolve via vendor docs or by observing the port on a
+   scan.
+2. **Serial vs. USB-CDC vs. TCP/IP** for *this* unit: `-W` is Wiegand/RS-232/485. Decide the host
+   wiring (a USB-RS232/485 adapter on TX/RX, most likely).
+3. **Does Wiegand mode even carry QR?** Likely Wiegand is for the optional *card* modes only; confirm
+   so we don't design a Wiegand path for QR.
+
+## Next
+
+A `ReaderDevice` driver in `packages/devices` (serial transport) emitting `read` events. Add it to
+the [[device-registry]] under the `reader` category so the [[first-run-setup]] wizard can assign it
+per lane. Pending open-question #1 (the serial frame) before coding.
diff --git a/wiki/index.md b/wiki/index.md
index 0595f78..ea83e78 100644
--- a/wiki/index.md
+++ b/wiki/index.md
@@ -7,7 +7,7 @@ updated: 2026-06-14
 # Index
 
 Content catalog for the wiki. Start at [[overview]]. Maintained on every ingest.
-Counts: 1 source · 18 entities · 24 concepts · 5 decision records.
+Counts: 2 sources · 19 entities · 24 concepts · 5 decision records.
 
 ## Overview & navigation
 - [[overview]] — the top-level synthesis and entry point.
@@ -16,6 +16,7 @@ Counts: 1 source · 18 entities · 24 concepts · 5 decision records.
 
 ## Sources
 - [[parking-system-architecture]] — design notes: stack, threat model, devices, UHPPOTE, ESP32, readers, BOM, open decisions.
+- [[gee-qr-er80]] — datasheet: GEE QR access reader (QR/DM/1D; Wiegand/RS-232/485/USB/TCP; Linux).
 
 ## Entities — technology stack
 - [[technology-stack]] — the full stack table; all MIT/Apache/BSD, chosen to avoid lock-in.
@@ -37,6 +38,7 @@ Counts: 1 source · 18 entities · 24 concepts · 5 decision records.
 - [[atecc608]] — secure element; non-extractable signing key (host events + controller auth).
 - [[wiegand]] — reader standard feeding the controller directly (autonomous permit-holder path).
 - [[lpr-camera]] — edge-AI plate recognition; host-side casual-identity source.
+- [[gee-qr-er80]] — QR access reader on hand; host-side serial → `read` bus (the QR-ticket scanner).
 - [[zkteco-controller]] — ❌ rejected/historical; aux-input path was a contender, not pursued.
 - [[dingtian-relay]] — ✅ CHOSEN access controller; decoupled inputs solve the button blocker (driver verified on hardware).
 - [[rongta-printer]] — ✅ CHOSEN 80mm thermal printer; ESC/POS over raw TCP 9100; driver written, one unit reachable at 10.0.10.6.
diff --git a/wiki/log.md b/wiki/log.md
index f9093ee..cc713f5 100644
--- a/wiki/log.md
+++ b/wiki/log.md
@@ -607,3 +607,19 @@ guarantee. Recorded in [[dingtian-relay]] (new Hardening section).
   free −1); exit frees a slot; routes RBAC (op can't set, −5→400, set/clear ok); verifyChain ok.
   Full build 5/5. Physical FULL-sign relay output deferred.
 - Updated [[capacity-occupancy]] (as-built).
+
+## [2026-06-16] ingest | GEE-QR-ER80 QR access reader datasheet
+- User has the reader; ingested `raw/GEE-QR-ER80 QR Code Access Control Reader.pdf`.
+- CORRECTION: earlier guessed "ER80-EM" = a 125 kHz EM4100 prox-card reader. WRONG — the datasheet
+  shows **GEE-QR-ER80**, a **QR / DataMatrix / 1D barcode** optical access reader (optional ID/IC
+  card). It's the [[ticket-encoding|QR ticket]] scanner the design already needed, not a card reader.
+- Specs: interfaces Wiegand 26/34 · RS-232 · RS-485 · USB · TCP/IP; 4–15 VDC <800 mA; 360°;
+  Windows + **Linux**; wiring VCC/GND/D0/D1/TX(R+)/RX(R-)/LED/BEEP. On hand: **`-Q-W`** (QR scanner;
+  Wiegand/RS-232/RS-485).
+- Fit: host-side reader → a serial `ReaderDevice` adapter emitting `read` events → consumed by the
+  already-built exit flow + QR-permit path. Prefer RS-232/485 (serial) over Wiegand (Wiegand can't
+  carry variable-length QR; autonomy moot since [[dingtian-relay]] has no onboard ACL).
+- New: source [[gee-qr-er80]] summary + entity [[gee-qr-er80]]. Updated [[ticket-encoding]],
+  [[entry-exit-readers]], [[index]].
+- OPEN (blocks the adapter): the RS-232/485 **frame + baud** — is a QR scan an ASCII CR/LF string
+  (expected) or framed? Datasheet omits it; resolve via vendor docs or by observing the port.
diff --git a/wiki/raw/GEE-QR-ER80 QR Code Access Control Reader.pdf b/wiki/raw/GEE-QR-ER80 QR Code Access Control Reader.pdf
new file mode 100644
index 0000000..eca161c
Binary files /dev/null and b/wiki/raw/GEE-QR-ER80 QR Code Access Control Reader.pdf differ
diff --git a/wiki/sources/gee-qr-er80.md b/wiki/sources/gee-qr-er80.md
new file mode 100644
index 0000000..c7dd832
--- /dev/null
+++ b/wiki/sources/gee-qr-er80.md
@@ -0,0 +1,37 @@
+---
+type: source
+tags: [parking, hardware, readers, qr, datasheet]
+sources: [gee-qr-er80]
+updated: 2026-06-16
+---
+
+# Source: GEE-QR-ER80 QR Code Access Control Reader (datasheet)
+
+Vendor datasheet (GEE NFC LIMITED, ©2007–2019) for the **GEE-QR-ER80** — a static
+**QR-code access-control reader**, optional ID/IC card. The reader the project has
+on hand for the [[ticket-encoding|QR ticket]] path. Raw:
+`raw/GEE-QR-ER80 QR Code Access Control Reader.pdf` (3 pages). Entity: [[gee-qr-er80]].
+
+## Key takeaways
+
+- **Optical scanner**, not a prox-card reader: reads **QR, DataMatrix, 1D barcode** (static).
+  Optional add-ons for **IC card UID / ID card**.
+- **Multi-interface:** **Wiegand 26/34, RS-232, RS-485, USB, TCP/IP** — selectable by variant.
+- **Power:** 4–15 VDC, < 800 mA. **Read direction:** 360°. Built-in scanner LED.
+- **OS:** Windows XP/7/8/10 **and Linux** (explicit) — fits the [[disk-os-hardening|Linux appliance]].
+- **Wiring (Wiegand/RS-232/485 variant):** VCC(+12V), GND, **D0/D1** (Wiegand), **TX/R+ , RX/R-**
+  (RS-232 / RS-485), plus **LED** and **BEEP** control lines (host can drive feedback).
+- **Order code** `GEE-QR-ER80-<scanner>-<interface>`: `Q`=QR scanner / `D`=ID reader / `C`=IC reader;
+  `W`=WG·RS232·RS485 / `U`=USB / `T`=RJ45 (TCP/IP). **On hand: `-Q-W`** (QR scanner; Wiegand/RS-232/RS-485).
+
+## Section map
+
+- p1 — overview, physical + feature table (interfaces, power, read direction).
+- p2 — supported types (QR/DM/1D + optional IC/ID), OS, environment; **wire definition** (pin table).
+- p3 — order-code breakdown, applications (access control / vacation rentals / time attendance).
+
+## Not in this datasheet (open)
+
+- The **RS-232/RS-485 data protocol**: baud rate, frame format, and whether a QR scan is emitted as
+  an **ASCII string** (expected) vs. some framed protocol. Decides the host-side adapter — see
+  [[gee-qr-er80]] open questions. Resolve by vendor docs or by observing the port on a scan.