This support article lists the most frequently asked technical questions for the Impinj R700 RAIN RFID reader and R720 RAIN RFID reader, known as the R700 series readers. For the Impinj IoT device interface technical FAQ, please refer to the Impinj IoT Device Interface FAQ.
How can I set the maximum power of 33 dBm with the Impinj R700 series readers?
Web UI method:
1. Make sure your PoE power source is compliant to 802.3at standard (PoE+).
2. On the Home tab of the Web UI under Power Source, select PoE+ from drop-down
3. Reboot reader
Rshell method:
1. Make sure your PoE power source is compliant to 802.3at standard (PoE+).
2. For Impinj R700 ETSI region only, select ETSI Upper band (EU2) as the Impinj R700 region.
3. Run the following RShell command on the Impinj R700 series reader:
> show system power
4. If it is not set to PoE+, issue the following Rshell command on the Impinj R700:
> config system power source PoE+
REST API method:
1. Power Source settings may also be configured through the /system/power endpoint in the reader configuration REST API. See an example below.
> curl -u root:impinj -k –request PUT https://<ip address or hostname>/api/v1/system/power -d “{\”powerSource\”:\”poeplus\”}”
What is the minimum transmit power I can configure with the Impinj R700 series readers?
10 dBm.
What options are available to power the Impinj R700 series readers?
The Impinj R700 series readers are powered exclusively via power over ethernet (PoE or PoE+). Many commercial switches offer this capability. For use cases that require AC connectivity, Impinj sells a midspan injector (P/N IPJ-A2010) that adds PoE+ capability to an existing network connection. There are many commercial off-the-shelf options available for other PoE injecting solutions.
What are the power requirement differences between the Impinj R700 and Impinj R720?
The Impinj R720 requires approximately 2 watts more power than the Impinj R700. Due to this difference, it is recommended to use PoE+ to power the R720. PoE power is only recommended for the R720 if the device is running a transmit power of 20 dBm or less and is not using any peripherals.
How can I set the maximum receive sensitivity of -93 dBm with the Impinj R700 series readers?
Maximum receive sensitivity varies depending on the reader mode you select. In the Impinj ItemTest software, check the “Enable Max Sensitivity” option to use the maximum receive sensitivity for the reader mode you are using.
When using the Impinj IoT device interface, omitting the “receiveSensitivityDbm” field from a preset configuration JSON will cause the reader to report tags at the greatest sensitivity for any given mode.
For more information on different RF Modes on the Impinj R700 series readers, please refer to Impinj R700 Reader Modes (RF Modes) article.
For more information describing how to optimize your deployment for receive sensitivity, please refer to Why Receive Sensitivity Matters article.
Why did the published R700 receive sensitivity values change from -92 dBm to -93 dBm?
Along with the launch of the R720, Impinj changed their standard methodology for measuring receive sensitivity for all fixed readers, including both the R700 series and Speedway series products. The new methodology is better aligned with RAIN Alliance recommendations and the ISO 18046-2:2020 industry standard. This change appears to have improved the published values, however, Impinj’s fixed readers have not had any changes made to them that functionally improved their receive sensitivity.
For more information about this new methodology, including step-by-step directions, please refer to the How to Perform Reader Sensitivity Testing application note.
How can I know which antenna port an Impinj R700 series reader is using to read tags?
ItemTest software’s Antenna column automatically displays which antenna port that the Impinj R700 series reader is using to read tags.
If you are using IoT Device Interface on 8.2.0 or newer firmware, under the Tag Streaming tab, there is an Antenna column that displays the antenna port number that last read a particular EPC.
If you are reading from output options in the Impinj IoT device interface (Ex: HTTP Stream, MQTT, Kafka), the inventory preset can be configured so that tagInventoryEvents will include the port name or number where the tag was seen.
What type of Ethernet cable can I use for powering the Impinj R700 series reader via PoE/PoE+?
Any IEEE 802.3 compliant Ethernet cable should work with the Impinj R700 series readers.
However, the maximum length of the Ethernet cable will vary depending on the power source and the Tx Power you use. See tables below for each available R700 series reader.
Impinj R700:
| Power Source | Tx Max | Cable Max |
| 802.3at PoE+ | 33 dBm | 100 Meters |
| 802.3af PoE | 27 dBm | 100 Meters |
| 802.3af PoE | 30 dBm | 60 Meters |
Impinj R720:
| Power Source | Tx Max | Cable Max |
| 802.3at PoE+ | 33 dBm | 100 Meters |
| 802.3af PoE | 20 dBm | 60 Meters |
For more information, please refer to the Impinj R700 series Installation and Operations Guide found under R700 Series Documents and Downloads.
Can I connect to the Impinj R700 series reader from a Linux laptop?
Yes. If you run into connection issues, please refer to the following Support Portal article: Troubleshooting Reader Connectivity Issues.
Can I use the application that I developed for an Impinj Speedway reader with an Impinj R700 series reader?
In general, yes. The LLRP interfaces available on Impinj Speedway readers are also available on Impinj R700 series readers. You may need to modify the code for the Impinj R700/R720 specific settings and/or values. Please note that NOT all capabilities are present in the Impinj R700 or R720, such as Doppler.
Applications that run directly on an Impinj Speedway reader will need to be recompiled for the Impinj R700/R720.
For more details, please refer to Speedway to R700: Migration Application Note
Can the Impinj R700 or R720 buffer tag reads and/or events if the network goes down?
Yes. The buffer size is different depending on the interface you use:
- LLRP interface: up to 1000 tag reads
- IoT Device Interface: up to 300,000 events (for both the HTTP Streaming and MQTT output)
What cipher suites does the Impinj R700 support for TLS connection?
As of the firmware 7.6.0, the Impinj R700 supports the following cipher suites:
HTTPS port 443
TLSv1.2 (server order)
- TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
- TLS_RSA_WITH_AES_256_GCM_SHA384
- TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLSv1.3 (server order)
- TLS_AES_256_GCM_SHA384
- TLS_CHACHA20_POLY1305_SHA256
- TLS_AES_128_GCM_SHA256
LLRPS port 5085
TLSv1.2 (no server order, thus listed by strength)
- TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
- TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
- TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
- TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
- TLS_RSA_WITH_AES_256_GCM_SHA384
- TLS_RSA_WITH_AES_256_CBC_SHA256
- TLS_RSA_WITH_AES_256_CBC_SHA
- TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
- TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
- TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
- TLS_RSA_WITH_AES_128_GCM_SHA256
- TLS_RSA_WITH_AES_128_CBC_SHA256
- TLS_RSA_WITH_AES_128_CBC_SHA
TLSv1.3 (no server order, thus listed by strength)
- TLS_AES_256_GCM_SHA384
- TLS_CHACHA20_POLY1305_SHA256
- TLS_AES_128_GCM_SHA256
How can I get started developing on-reader applications with the Impinj R700 Series?
Please refer to the Impinj R700 Embedded Toolkit Quick Start Guide.
You can also watch the Impinj online training videos (Impinj partner only):
http://learning.impinj.com/.
Is Speedway Connect available for the Impinj R700 and Impinj R720?
No. Impinj Speedway Connect only runs on Impinj Speedway readers, Impinj xArray, Impinj xSpan, and Impinj xPortal. When configured to use the Impinj IoT device interface, the Impinj R700 and R720 displays with a native web UI and native IoT connectivity that offers similar functionality to Impinj Speedway Connect. The UI is there for both modes, I’d start the last sentence stating the new series has a built in Web interface.
For more information, please refer to the following Support Portal article: How to Configure the Impinj R700 RAIN RFID Reader for Inventory Operation Using Presets. This does not seem to be related to the last question.
Can I use GPI to trigger start and stop of inventorying?
Yes. The Impinj IoT device interface supports this through a preset configuration using the "startTriggers" and "stopTriggers" JSON fields. Please reference the Impinj IoT Device Interface documentation for more information. Also using the built in Web UI.
The LLRP interface may also be used to configure the reader to use a GPI as a start or stop trigger: Setting up GPI Triggers with LLRP.
Which male terminal block can I use with the GPIO ports on the Impinj R700 series readers?
One example is, PHOENIX CONTACT Printed-circuit board connector, 1803646.
For more information on the Impinj R700 series readers and GPIO, please refer to Connecting GPIO devices to Impinj R700.
Can I add extra GPIO ports to the Impinj R700 series readers?
Impinj R700 has two general purpose inputs and three opto-isolated outputs. Adding extra GPIO ports directly to the reader is not supported. You may choose to use a networked GPIO device if the network latency is not a concern.
Which Wi-Fi dongles does the Impinj R700 series readers support?
Impinj R700 series readers currently supports the following Wi-Fi chipset:
- Ralink RT2870
- Realtek 8821CU
For more information, please refer to the following Support Portal article: How to use an Impinj R700 Reader with a USB WiFi Adapter.
For which countries/regions are the Impinj R700 and Impinj R720 certified?
Please refer to the following Support Portal article for all fixed reader and Gateway products: Certified Regions and Geographies.
Are the Impinj R700 and Impinj R720 RoHS certified?
Yes. For more information, please refer to the following RoHS Compliance document found under the R700 Series Documents and Downloads webpage.
For PoE, are there any requirement differences between Impinj Speedway series and Impinj R700?
Yes, power requirements vary depending on the use of power drawn from the USB ports, the current draw from the GPIO port, and the length of the Ethernet cable from the power source to the reader. These differences for R700 are outlined in the table below:
| Power Source | TX Max | Cable Max | GPIO + USB Max |
| 802.3at PoE+ | 33 dBm | 100 Meters | 5V/500 mA |
| 802.3af PoE | 27 dBm | 100 Meters | 5V/500 mA |
| 802.3af PoE | 30 dBm | 60 Meters | None |
These differences for R720 are outlined in the table below:
| Power Source | TX Max | Cable Max | GPIO + USB Max |
| 802.3at PoE+ | 33 dBm | 100 Meters | 5V/500 mA |
| 802.3af PoE | 20 dBm | 60 Meters | None |
In general, the more power that is being used, the more likely that PoE+ will be needed to supply enough power to keep the reader operating without "browning out". For more information, please refer to the R700 Installation and Operations Guide found here.
Is there an antenna hub available for the Impinj R700 and R720?
Yes, the Impinj R700 antenna hub is available for R700 series readers. For more information, please refer to the following document: Impinj R700 Antenna Hub Guide. This guide is available through the R700 Series Documents and Downloads link.
The Impinj R700 antenna hub is compatible with the Impinj R720.
When should I choose the Impinj R720 over the Impinj R700 for a deployment?
The R720 and R700 are both designed to support global RAIN deployments that need industry-leading performance, enterprise-grade reliability and security, and support next-generation RAIN tags. The Impinj R720 has a Qualcomm quad-core processor with a 1.4 GHz clock speed and therefore is better suited for IoT solutions that require additional edge processing power. The R720 is designed to fulfill the needs of partners and customers that require increasingly complex on-reader applications and algorithms required for their solutions.
What is the operating and storage temperatures for the Impinj R700 series readers?
| Operating temperature | -4° F to 122° F (-20° C to 50° C) |
| Storage temperature | -4° F to 158° F (-20° C to 70° C) |
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