Impinj RFID readers.

The Impinj R720 is an enterprise-grade 4-port fixed RFID reader and the backbone of most professional UHF RFID deployments. It offers industry-leading read sensitivity (-97 dBm), supports Impinj's IoT device management platform for remote configuration and monitoring, and handles the full range of applications from simple single-antenna read points to complex multi-antenna portals. If you're building a fixed RFID infrastructure, the R720 is the standard against which other readers are measured.

Key specifications

• 4 monostatic RP-TNC antenna ports
• Sensitivity: -97 dBm
• Max TX power: 33 dBm (2W) conducted
• PoE+ powered (802.3at, 30W)
• Impinj IoT firmware with cloud management
• RAIN RFID (UHF Gen2v2 / ISO 18000-63)
• Ethernet (10/100/1000) + USB
• IP52 rated enclosure
• LLRP, Impinj IoT, and REST API
• Operating temp: -20°C to +50°C
• Dimensions: ~26 x 26 x 5 cm
• Weight: ~1.6 kg

Application notes

Recommended pairings & usage suggestions

1. 1Unboxing & InspectionThe box contains: R720 reader, quick-start guide, and mounting plate. PoE+ injector and antennas are sold separately. Check all 4 antenna ports for damage (RP-TNC female connectors). Verify the serial number on the label matches your purchase records — you'll need it for Impinj IoT registration.
2. 2Planning Antenna LayoutBefore mounting the reader, plan your antenna positions. Each of the 4 ports can drive one antenna. For portals: 2 ports for left/right panels. For zone coverage: up to 4 antennas in a sector pattern. Measure cable distances from the planned reader location to each antenna — keep runs under 10m if possible. Sketch the layout with port assignments (Port 1 = left panel, Port 2 = right panel, etc.).
3. 3Mounting the ReaderUse the rear mounting plate to wall-mount, ceiling-mount, or shelf-mount the reader. For ceiling mounts, the reader can sit above ceiling tiles with only the antenna cables dropping down. Ensure the mounting location has Ethernet connectivity (PoE+ switch or injector). Leave access for the USB port (useful for initial setup if network isn't ready). Allow 5cm clearance on all sides for heat dissipation.
4. 4Antenna ConnectionsConnect each antenna's coaxial cable to the corresponding R720 port. The ports are numbered 1–4 on the reader. Hand-tighten RP-TNC connectors, then snug with a wrench (1/4 turn past finger-tight). Do NOT overtighten — the reader's internal connector can be damaged. Record which physical antenna connects to which port number. Use cable labels.
5. 5Power & NetworkConnect the Ethernet cable from your PoE+ switch or injector to the reader's Ethernet port. The reader boots automatically when PoE+ power is supplied — there's no power button. Boot time is approximately 60 seconds. The reader obtains an IP address via DHCP by default. Check your DHCP server or router to find the reader's assigned IP. Alternatively, connect a laptop directly via the USB port for initial configuration.
6. 6Accessing the Web InterfaceOpen a browser and navigate to http://[reader-ip]. The default credentials are in the quick-start guide (typically admin/impinj). On first login, you'll be prompted to change the password and complete the setup wizard. The wizard walks through: region settings (critical — must match your country's UHF frequency allocation), network configuration, and basic antenna settings.
7. 7Configuring Antenna PortsNavigate to the Antennas section. For each connected port: Enable the port, Set TX power (start at 25 dBm for portals, 15 dBm for nearfield, 30+ dBm for long range), Set RX sensitivity (maximum, unless you're intentionally limiting range). Disable unused ports — an enabled port with no antenna connected will generate reflection errors and slow performance.
8. 8Session & Search Mode SettingsThese are critical for performance. Session 1: Tags reset quickly. Use for point-of-interaction reads where the same tag may be read repeatedly (e.g., nearfield stations). Session 2: Tags persist after being read. Use for portals where you want to capture tags once as they pass through, without re-reading items that linger. Search mode: Single-target for fastest initial reads, Dual-target for persistent monitoring. Population estimate: Set roughly to the number of tags you expect in the read zone at once (1 for nearfield, 10–50 for portals, 100+ for area inventory).
9. 9Connecting to Middleware / ApplicationThe R720 supports multiple connection modes: LLRP (standard RFID protocol, port 5084) — most middleware platforms support this. Impinj IoT (ItemSense/Cloud) — for Impinj's own management platform. REST API — for custom integrations. Configure your middleware to connect to the reader's IP on the appropriate port. Verify the connection shows as active in the reader's web interface. For Inventrack, use the LLRP connection with the reader's IP address.
10. 10Testing & ValidationGo to the reader's web interface tag inventory page. Hold a tagged item near each antenna and verify reads appear. Note the RSSI (signal strength) values — they indicate read quality. RSSI of -40 to -60 dBm indicates a strong, close read. RSSI of -70 to -80 dBm is a weak, long-range read. For portal testing, walk through 20+ times and verify 99%+ capture rate. Check that the correct antenna port is reporting each read (this validates your physical layout matches your port mapping).
11. 11Impinj IoT Cloud Registration (Optional)If you want remote management, register the reader with Impinj's cloud platform using its serial number. This enables: remote configuration changes, firmware updates, health monitoring, and multi-reader management. This is highly recommended for deployments of 5+ readers.
12. 12TroubleshootingReader doesn't boot (no LEDs): Verify PoE+ (802.3at) power. Standard PoE (802.3af) won't work — the R720 requires 30W. Check the Ethernet cable and PoE source. Can't find reader on network: Check DHCP lease table on your router. Try connecting via USB. The reader may be on a different VLAN. Antenna port errors: An enabled port with no antenna connected shows high reflected power. Disable unused ports. A port with a damaged connector or cable shows intermittent errors. Low read rates at portals: Check cable quality, verify Session 2 settings, increase TX power, check antenna alignment. Reader overheating (thermal throttle warning): Ensure adequate ventilation. Don't mount in direct sunlight or enclosed spaces without airflow. Operating range is -20°C to +50°C.