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6270A firmware update instructions, by 9-pin RS232 cable

Updating the firmware (embedded software) of a 6270A pressure controller is very easy and only requires a null modem RS-232 serial cable (pins 2 and 3 are crossed), a computer with a RS-232 serial port, and the firmware files.

Note: that if you operate more than one 6270A controller in stacked mode, they must be updated independently and directly (not while in stacked mode.

Note: If you prefer to update by USB cable (recommended) then see this page:


The current main version is 1.11 and was released June 2022. The name of the download file is 6270A v111 

Until the below web pages are updated, v1.11 of the main firmware is attached to this article and can be downloaded at the link at the end of this article. 



View the instructions and download the firmware file(s) from the following web page. Note that you must have a login to the website to download the firmware. A "Login" link is on this same web page if you need to register. 

You can also view the changes, fixes and additions for each revision on the above page.

The 6270A Operators Manual and Programmers Manual were updated in mid-2018 with new features and commands of the new firmware. Manuals can be downloaded from this page,

If you have questions, contact Fluke Calibration Pressure Technical Support at the below link or by calling 1-877-355-3225

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