Trimble R4 II firmware update.

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GNSS & Geodesy

Last Post by FrankG 8 months ago

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tonyduky

(@tonyduky)

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Hi, we're trying to do a firmware update of our old trimble r4 II through the serial port. Can anyone recommend a model/brabd of rs232 cable and usb adaptor that will actually work? Prolific? FTDI? Where can we find the infos on wich cable/adaptor chipset will actually work with this? So far we tried a rs232 to usb cable but Winflash doesnt recognize it even if its recognized in windows device manager (Prolific on COM6).

Thanks a lot for your help!

Posted : February 10, 2026 2:54 am

jhframe

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I don't have experience with the R4, but with the older Trimble models I've had reliable success with adapters using the FTDI chipset. I don't have a specific brand recommendation, but as long as it uses the genuine FTDI chipset it should be okay.

Posted : February 10, 2026 9:02 am

tonyduky

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