TR75A Firmware Update Tool

This is an update program for the TR75A firmware.


This is an update program for the TR75A firmware.

Compatible ProductsTR75A
VersionVer. 1.05 (October 16, 2023)
File Nameapp-tr75a-firm-105-all.exe
File Size8.02 MB
Operating EnvironmentCompatible OS  *1
Microsoft Windows 11 64bit English
Microsoft Windows 10 32/64bit English
CopyrightT&D Corporation
ReplicationCopying to another media is expressly forbidden
*1: For installation, it is necessary to have Administrator (Computer Administrator) rights.

How to Check your TR75A Firmware Version

T&D WebStorage Service

  1. From the [Devices] menu, open the settings window by clicking the [Settings] button for the desired device.
  2. Read off the "Firmware" version next to the "Serial Number" located at the top of the window.


  1. Open T&D software "TR7 for Windows" and connect your device via USB to the computer.
  2. Read off the "Firmware Version" value located at the lower left on the screen.

Mobile Device

  1. Open the "T&D Thermo" app and select the target device in the list.
  2. Tap on [Bluetooth] in the task bar.
  3. Go to [Settings Table] and read off the "Firmware Version" value.

Firmware Update Procedure

  • All recorded data will be deleted by updating the firmware. Please make sure to download all necessary data before update.
  • The firmware update requires a USB connection between a device and a PC.

Before connecting a USB cable, make sure that the PC has the USB device driver installed. (By installing the application "TR7 for Windows", the USB device driver will also be installed.)

  1. Connect the device via USB to the computer.
  2. Open the downloaded "TR75A Firmware Update Tool".
  3. Follow the instructions on the screen to update the firmware.

If the update completes successfully, the new firmware version will be displayed as AXXX (XXX represents the version number) at the bottom of the LCD screen when the power is turned on.

Revision History

Ver. 1.05October 16, 2023

  • Some operations of the battery level warning have been revised.
    - Revised battery warning recovery criteria to avoid sending low battery warnings repeatedly.
    - Changed the state of battery warning sent when a low battery recovery has occurred from 1 (normal) to 81 (recovery to normal).
    - Changed the specifications for sending any untransmitted battery warnings when low battery recovery has occurred.
  • Added functionality to send the state of Warning Lifted (state:82) when the warning settings have been changed, the recording has been started, or the device has been reset while in a warning state.
  • Functionality was added whereby if upon recovery from a sensor error, an upper/lower limit warning is still active, the status (state:83) will be sent.
  • When sending data via a proxy server, the connection is now made using a host name instead of an IP address. (White list compatible)
  • Previously command processing was aborted when the response from an HTTP server was R=0 (command rejected). Processing has now been modified so that a request is issued for the command specified by the flag contained in the response.
  • Fixed a problem that occurred when the auto-upload interval was set to 24 hours, where recorded data was being sent every 5 hours and 50 minutes.
  • The measured values displayed in warning e-mails have been changed from the “instantaneous values” at the time of warning judgment to the “max/min values” during the specified judgment time.
  • Sensor error information was added to Bluetooth advertisement packets.
  • Fixed an issue that occurred when resending multiple warning data after transmission failures (due to low battery, etc.), where the battery status at the time of successful transmission was reported instead of the battery status at the time of the warning.

Ver. 1.04August 7, 2023

  • Fixed a problem in which the temperature measurement range before reporting an error was narrower than the specification.
    Thermocouple Type: Before/After Correction
    Type K: -199 to 1270 °C / -199 to 1370 °C
    Type J: -199 to 1100 °C / -199 to 1200 °C
    Type T: -199 to 300 °C / -199 to 400 °C
    Type E: -199 to 900 °C / -199 to 1000 °C
    Type S: -50 to 1660 °C / -50 to 1760 °C
    Type R: -50 to 1660 °C / -50 to 1760 °C

Ver. 1.03August 30, 2022

  • Fixed a problem where the time of the first data could be recorded incorrectly in the following situation: You start the recording after changing the recording interval with the buttons on the logger, and keep pressing the REC/STOP button after the REC icon appears on the LCD.

Ver. 1.02June 27, 2022

  • Fixed a problem that occurred when setting the device clock to "Synchronize with SNTP Server", where the synchronization failed in rare cases and caused incorrect timestamp calculations.
    See here for details.

Ver. 1.01 March 14, 2022

  • Changed the message to be displayed on the LCD when the battery voltage is low from [dEAd bAtt] to [Lo bAtt].
  • When passcode lock is enabled and you enter the wrong passcode three times in a row, the lock cannot be disabled for one minute now.

User Agreement


  1. Although T&D Corporation has carried out operational tests on TR75A Firmware Update Tool, hereafter referred to as "the software", we cannot guarantee that all operations will work properly under all conditions.
  2. T&D Corporation shall not accept any responsibility for any damage whether direct or indirect that results from the usage of the software.
  3. Specifications of the software may be subject to change and service may be terminated without advance notice to the user. In such a case T&D Corporation shall not be responsible for any damages whether direct or indirect from the inability to use the software.
  4. T&D Corporation has no obligation to correct any defects found in the software.


  1. All copyrights for the software, including all of the programs and all related documents, are the sole property of T&D Corporation.
  2. The software is for use free of charge. Redistribution is permitted as long as it is to others for non-profit. In this case, all terms and conditions as written in the above disclaimers automatically transfer and hold true and valid for the party to which the program was redistributed. Please note that if you wish to commercially redistribute the program please contact your local distributor or T&D representative.
  3. The reprinting or redistribution for commercial purposes whether in part or in whole, in magazines or as a part of any product is strictly forbidden without the expressed consent of T&D Corporation. Any inquiries concerning commercial redistribution should be directed to the Sales Department of T&D Corporation.
  4. Please do not attempt to make any changes or modifications to the software.
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