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xArray Gateway - Frequently Asked Questions (FAQ)


Q: Where can I purchase an xArray?


Please see this page.


Q: What are the ideal and max heights for mounting the xArray device?


xArray provides the best performance and coverage area when mounted at heights from 10 feet to 15 feet. A site survey that evaluates the RF characteristics of the environment and the choice of tags is recommended to determine the optimal mounting height. Best results will be achieved with tags that use Impinj Monza R6 chips. 


Q: What is difference between the 1,500 ft range and Real Time Location of 1.5 meters discussed for xArary? 


1,500 square feet is the floor coverage area that xArray can monitor. Real-time location refers to xArray’s ability to pinpoint location of an item to within 1.5 meters (~5 feet) of the item’s actual location. 


Q: Do xArrays require a calibration process during the setup phase? 


xArray gateways can begin reading tags out of the box. They do not require calibration, but the xArray is highly configurable and tunable to work optimally in a given environment.


Q: Could you describe the concept of the 52 beams?  Is this a calculated number? 


The xArray gateway includes a sophisticated antenna array and is able to distinguish between 52 different beam states. A diagram on the xArray datasheet shows the 52 zones that xArray identifies on x,y coordinates.


Q: How fast does xArray scan the 52 beams?


Scan time for all 52 beams can take a few seconds up to several minutes depending on the number of tags in the field of view and the mode that the xArray is operating in.


Q: How does the xArray do the mapping / conversion of x,y to logical zone / location?


After identifying a 0,0 location point for a facility, each xArray establishes a x,y coordinate in relation to the 0,0 point it is mapped to. A software layer on top of the xArray can take these coordinates to create zones that you specify.


Q: Can the xArray reader capture motion of tags through the field?




Q: Does xArray require special software?


xArray gateways can begin reading tags out of the box using Impinj’s ItemTest software but additional software is typically required for enterprise deployments. ItemTest software allows for quick tests of xArray features and capabilities.


Q: Does xArray use LLRP protocol and/or Octane SDK?


Yes to both. xArray uses LLRP and Octane SDK fully supports the new features and user modes introduced by xArray.


Q: How does the xArray cope with multiple metal shelves (racking)?


Metal can certainly block line-of-sight of RF waves, though metal shelves can also improve tag readability due to their ability to reflect RF waves and allow the signal to get to hard-to-reach areas. Site surveys are recommended for environments which contain a lot of metal.


Q: Does the RF bounce in high metal environment impact the accuracy of the location sensing capabilities?


Yes, metal will impact the location-sensing ability of the xArray. A site survey by an Impinj xArray Certified Partner is recommended.


Q: Does the floor coating (e.g., carpet vs. marble) effect performance of xArray?


Floor coating should not adversely affect the xArray performance.


Q: If you mount the xArray on a wall looking forward, what distance will you get?


xArray is calibrated to meet the FCC mandated limit of 36 dBm EIRP. It will perform similarly to a Speedway Revolution reader with an off –the-shelf antenna when mounted in this fashion.


Q: Is the data output from xArray limited to the x-y coordinates or can it also provide z (height)?


xArray’s Location User modes provides x-y coordinates based on the height of the xArray with respect to the tag location. Elevation and Azimuth for the tag can be computed from the x-y coordinates but requires similar information to come from a different xArray to try to use triangulation to infer the height of the tag.


Q: What happens when there are walls in between the xArray and the tags?


Depending on the make-up of the wall, it may be possible to read through it with a xArray as can happen with other reader and antenna combinations. We do not recommend relying on the ability to read through walls to solve a use case. Shielding materials are also available to prevent reading of unwanted areas.


Q: When x/y events are translated to zone events by the agent software, does one xArray serve as a "master" to coordinate the data from multiple xArrays located close to each other?


No, each xArray works independently and is not aware of other xArrays sharing the same space. An xArray gateway is not able to receive information coming from other xArrays.


Q: Does xArray only work with specific Impinj tags, or does it work with other tags?


xArray supports all RAIN RFID tags however best performance is achieved with tags built on the Impinj Monza R6. This video highlights why tag chip selection matters: https://support.impinj.com/hc/en-us/articles/204244013-xArray-Gateways-Why-Tag-Selection-Matters-VIDEO-.  


Q: What is tag integration cost per product (shirt/tool/etc) to support xArray?


Tag prices are dependent on a number of factors including chip, form factor, volume, etc. Please contact a tag or inlay provider to determine pricing for the tag that meets your needs.


Q: How may tags can be read at the same time by each xArray?


xArray can achieve throughput of about 1,000 tags per second.


Q: Does tag orientation affect read range?


xArray provides excellent area coverage, always-on monitoring, and software to help it find even difficult to reach tags. Tag orientation can and will impact performance but xArray is designed with dual linearly polarized beams to minimize tag orientation effects.


Q: What size Tags/Inlays were used for the 1,500sq feet test?


This test was performed using 70mm by 14.5mm inlays.


Q: Is there a need for Site Surveys before installation?


Yes, A site survey and knowledge of RFID is recommended for a successful deployment. All xArray Certified Partners have been trained to understand xArray installation requirements.


Q: Are videos of best practices available?


Yes, we are continuing to develop content to support xArray solution developers. Please visit http://support.impinj.com.


Q: Where can I find information about xArray IP rating, temperature rating, etc.?


Please see the xArray datasheet at http://support.impinj.com


Q: Where can I buy an xArray?


Please visit http:// http://www.impinj.com/where-to-buy/ to find an xArray Certified Partner.


Q: How can I optimize the accuracy of the location algorithm used by the xArray Gateway?


The most effective way to optimize the location accuracy is to increase the number of tag reads by:

  1. Using a high-performing RAIN RFID tag such as those utilizing Monza R6 tag chip.
  2. Use the maximum tag throughput Reader Mode setting such as the default ‘Max Throughput’ (Mode 0) on the xArray Gateway
  3. Ensure each tag is seen by at least 2 xArray Gateways and use a weighted averaging algorithm – you can discuss with a certified xArray Partner to learn more
  4. Configure adjacent xArrays for different Session settings (i.e. one for ‘Session 2’ the adjacent for ‘Session 3’)


Q: Is the xArray Gateway an Electronic Article Surveillance (EAS) device?


While the xArray Gateway provides inventory information, which can be useful when deployed as part of an overall EAS strategy (along with Point-of-Sale data and EAS Detection Gates), it is not meant to be a stand-alone EAS device.


Q: How can I optimize inventory of tagged items using xArray Gateway in Wide Area Monitoring (WAM) mode?


The most effective way to optimize inventory of tagged items is to utilize tag suppression, specifically ‘Tag Focus’ mode if using Impinj Monza tag chips.


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Impinj (NASDAQ: PI) wirelessly connects billions of everyday items such as apparel, medical supplies, and automobile parts to consumer and business applications such as inventory management, patient safety, and asset tracking. The Impinj platform uses RAIN RFID, delivering information about items to the digital world and enabling the Internet of Things.