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How to Disable and Re-Enable AutoTune for Monza 6

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Introduction

This document outlines the process to disable and re-enable AutoTune using MultiReader. By default, Monza 6 chips will have AutoTune enabled. The instructions here use a Monza R6 tag and MultiReader but this process also works for Monza R6-P and Monza S6-C tag chips, noting that the AutoTune disable bit is in a different location. Any RAIN RFID reader that can read and write to reserved memory can follow the steps outlined here to disable or re-enable AutoTune.

Hardware Required

  • Windows host PC
  • Speedway Revolution with a Mini-Guardrail antenna, connected via Ethernet to the computer
  • Monza R6 tag

Software Required

AutoTune Disable Bit Location

The AutoTune disable bit is marked "A" on the memory map below, in word 5 of the reserved memory for Monza R6. When A is set to 0, AutoTune is enabled. When set to 1, AutoTune is disabled. To set this bit to one and disable AutoTune, send a write command to that word greater than or equal to 8000h, such as FFFFh. (Note that "8000" in hex is the same as "1000 0000 0000 0000" in binary.) Only bit A will be written to. This word may now be inventoried to verify that bit A has changed. To re-enable AutoTune, send a write command of less than or equal to 7FFFh, such as 0000h. This will effectively set A to 0.

Figure 1. Reserved memory map of Monza R6, taken from section 4.1 of the Monza R6 TagChip Datasheet

 

Note: The AutoTune disable bit is in in word 4 of reserved memory for Monza R6-P and Monza S6-C. When writing to this word for these tag chips, the short range bit, S, and the memory map selection bit, M, (Monza R6-P only) will be written to as well. Be sure to inlcude the desired values for these bits when changing the AutoTune value for these tag chips. For more information about Monza R6-P and Monza S6-C, please refer to the datasheets available at http://support.impinj.com.

Reading and Changing the AutoTune Status

To read the AutoTune status using MultiReader, open the program and connect to the reader. With a Mini-Guardrail antenna connected to the reader and a Monza R6 tag on the antenna, click "START an Inventory Run" with the reader in dual-target mode. Assuming only one tag the intended tag was inventoried, stop the run, right click the result, and select "Tag Memory [Uses Search Mode: Dual Target]".

 

Figure 2. Inventory tag


Next, read word 5 of reserved memory. The result below was 3a94h. Since 3h is 0011b, the AutoTune disable bit is 0, so AutoTune is enabled.

 

Figure 3. AutoTune Enabled

Next, the value FFFFh is written to word 5.

 

Figure 4. Command to Disable AutoTune

 

 After the write command succeeds, read the word back to verify AutoTune has been disabled. Note that AutoTune cannot be changed if Monza R6 has been permalocked.

 

Figure 5. AutoTune Disabled


The result now is ba94h. Since bh is 1011h, this shows that bit A is high and AutoTune is now disabled.

 

To re-enable AutoTune, the value 0000h is written to word 5.

 

Figure 6. Command to Enable AutoTune


Reading the value of word 5 one last time will confirm that AutoTune is again enabled.

 

Figure 7. AutoTune Enabled

AutoTune has been successfully disabled/enabled!


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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.