Installing the Latch R2

The Latch R2 physical installation is performed by a qualified technician using the R Series Installation Guide (PDF, included in the box). This article covers what to verify before installation, the wiring scenarios the R2 supports, the high-level mounting sequence, and how to activate the device after installation.

About the Latch R2

The R2 is a hardwired reader, not a battery-powered lock. It can be installed in two configurations:

Standalone: the R2 controls a door lock directly via its built-in lock relay. The R2 acts as both the credential reader and the access decision-maker.
Panel (reader-with-panel): the R2 sends credential data to a third-party access control panel via Wiegand (26-bit) or RS-485. The panel makes the access decision and controls the locking hardware. Use this configuration for Elevator Floor Access (EFA) and for properties standardizing on a specific access control system (Brivo ACS6000, Keyscan EC1500/EC2500, or any panel compatible with Wiegand 26-bit input).

Choose the configuration before ordering — the wiring runs and panel selection depend on which mode is being installed.

Before installation — confirm site conditions

Have the technician verify the following before mounting the device:

Power supply available: Class 2 isolated, UL-listed 12V to 24V DC power supply within the wiring distance allowed by the recommended gauge (see the install guide's wiring tables). The R2 has no batteries and does not operate during a power failure — install fail-secure locking hardware if the door must remain locked through outages.
Network connectivity: an Ethernet drop is mandatory for Elevator Floor Access and strongly recommended for any installation that uses Door State Notifications. WiFi is supported as a fallback (802.11 b/g/n, 2.4 GHz).
Locking hardware (standalone mode): electric strike or magnetic lock, with the appropriate power supply and fail-safe / fail-secure wiring.
Access control panel (panel mode): confirm the panel is on the DOOR-approved compatibility list. The panel must accept 26-bit Wiegand input. For panels not on the approved list, DOOR provides minimal installation support — confirm with DOOR before proceeding.
Sensors (for Door State Notifications): an egress sensor / Request-to-Exit (REX) and a door contact sensor, both with dry contact outputs compatible with the R2's inputs.
Mounting surface: a single-gang electrical box, a wall surface that allows the mounting plate to be anchored with #6 flathead screws, or a FABboxx bracket for non-standard surfaces (concrete, stucco, glass, mullions). FABboxx ordering takes about 3–4 weeks — order in advance if needed.
For EFA installations: the Property Manager must coordinate with DOOR Support before installation to set up the Floor Group Table. Email support@door.com to start that process.

If any of these are not in place, installation cannot proceed.

Wiring scenarios

The R2 has a 10-conductor cable harness plus an RJ45 Ethernet plug exiting the back of the device. Wire colors and terminals follow the install guide's Standard Reader Connections table — use the install PDF as the canonical reference during the wiring step.

Standalone wiring (R2 → lock relay → door lock)

Connect:

VIN (red) and GND (black) to the 12–24 VDC power supply.
NO/NC (yellow) and COM (blue) to the door lock circuit. Configure the relay as normally-open for fail-safe operation, or normally-closed for fail-secure operation. The relay reverts to open on power loss.
IO1 (orange), IO2 (purple), and IO3 (brown) to a Request-to-Exit, egress sensor, and door contact sensor as needed for the installation. Each IO is configurable as input or output.
RJ45 plug to a router for Ethernet connectivity.

Skip the Wiegand wires (A/D0, B/D1, COM_GND) in standalone mode — they are unused unless the R2 is wired to a panel and should be securely tied back and isolated to ensure they won't cause interference.

Panel wiring (R2 → access control panel → lock and / or elevator)

Connect:

VIN (red) and GND (black) to the 12–24 VDC power supply.
A/D0 (green), B/D1 (white), and COM_GND (gray) to the access control panel's Wiegand or RS-485 input.
RJ45 plug to a router (required for EFA, recommended otherwise).
The locking hardware and any sensors are wired to the access control panel, not directly to the R2.

For EFA, the access control panel must be programmed with a Floor Group Table that mirrors the table DOOR generates and exposes in the DOOR app's Device Detail page. See the Latch R - Elevator Floor Access (EFA) article for the programming flow.

Minimum wire gauge by distance

The install guide includes wiring distance tables. As a quick reference for power runs:

Distance	12 V	24 V
< 50 ft	22 AWG	22 AWG
< 200 ft	20 AWG	20 AWG
< 500 ft	18 AWG	20 AWG
< 1000 ft	14 AWG	20 AWG

Wiegand runs (shielded cable) use 22 AWG up to 200 ft, then 20 AWG up to 1000 ft. Always confirm against the install PDF for the specific scenario.

Mounting sequence

The install guide describes 6 high-level steps with diagrams. At a high level the technician will:

Drill and prepare the mounting holes using the mounting plate as a template. Run wiring through the central 1.5-inch pass-through.
Secure the mounting plate to the wall or single-gang box using #6 flathead screws or the screws provided. Do not use pan-head screws — they prevent the device from seating flush and will cause the unit to disengage. For hard surfaces, use the appropriate FABboxx bracket.
Connect the wiring per the standalone or panel diagram chosen above. Confirm all terminations are secure and there are no pinched or stripped wires.
Apply power only after all wiring is complete and verified.
Mount the R2 onto the plate: insert the bottom locking tab of the mounting plate into the device, then press the R2 flush and slide it down until all mounting tabs are seated.
Tighten the security screw at the bottom of the device to lock it onto the mounting plate.

Use the screws provided (or matching #6 flathead screws). Pan-head screws will cause the device to disengage from the mounting plate.

Activating the device

After mounting and powering the device, activation has two parts: the door must exist in DOOR OS, and the device is activated from the DOOR app.

1. Confirm the door exists in DOOR OS Log in to DOOR OS → Access → Doors → confirm the door where the R2 was installed is listed. If not, create it before proceeding.

2. Activate the device from the DOOR app

Open the DOOR app → go to the Devices tab.
Tap Add a device and scan the QR code on the device or enter the serial number manually.
Pair the R2 over Bluetooth and complete the on-screen activation flow.
For Elevator Floor Access installations, select FW Version 5.1x.xx during activation, per the EFA documentation. EFA cannot be added later if the wrong firmware was selected — confirm at activation time.
Configure Ethernet or WiFi: in the DOOR app, go to Devices → select the door → Settings. Internet is mandatory for EFA installations.

A phone with the DOOR app must be within Bluetooth range of the R2 throughout the activation flow.

Verification

Before closing out the installation, run through this checklist:

Power: confirm 12–24 VDC at the VIN/GND terminals. Keypad backlight illuminates when a finger is detected on the touch surface.
Authentication test: present a doorcode, a Latch Keycard, and a DOOR app unlock. The R2's indicator LEDs should illuminate and power down in a clockwise animation on success, and the audible buzzer should sound.
Relock timing: confirm the lock releases for the configured 5- or 10-second window and returns to locked state automatically.
Network connectivity: in the DOOR app Device Detail page, confirm the Internet Status reads Ethernet Connected, WiFi Connected, or both.
Door State Notifications (if configured): test the egress sensor and door contact sensor by opening the door and confirming Door State transitions in the DOOR app (Secure → Ajar → Secure). See the DSN SOP for the full test procedure.
EFA (if installed): test each Floor Group at the elevator by presenting a test credential for each group and confirming the correct floors unlock. The Property Manager should create test accounts before installation day and delete them after testing.
Fail-safe / fail-secure verification: confirm the locking hardware behaves correctly when power is removed — this is the only way to confirm the relay wiring matches the intended fail mode.

Attachments

R Device Installation Guide (PDF) — full step-by-step with wiring diagrams.
R2 Spec Sheet (PDF) — dimensions, certifications, electrical specs.

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