Error messages - checksum error, malformed json received

Technical Support and Questions

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Janina Konarska

submitted 4 months ago.

Hi, I have just started using Multispec 1.0 (protocol: RIDES131AirflowZero), and I keep getting two error messages each time I try to take a measurement: "Checksum error. Please try again" or "Malformed json received". Does anyone know what these errors mean, what they are caused by and how to fix them? I tested the instrument two days ago with the same protocol and everything worked fine. Both the instrument and the tablet are charged, and the tablet can communicate with the instrument.

Many thanks in advance for help,

Best regards, Janina

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Sean

submitted 4 months ago.

Hey Janina,

I checked out your measurements from yesterday and think I have some suggestions for your issues. First and foremost I see you are using firmware version 1.20, and kudos to you for finding this and testing it on your own accord. BUT! This firmware is still in development and has many many bugs we are working to sort out before we release it to everyone. So it makes sense sometimes it will work, sometimes it will not. In addition, the protocol you chose is also an experimental protocol we are working on as well. More power to you for checking it out and experimenting, but just understand both the protocol and firmware you chose are both experimental and not stable!

What are you interested in measuring? I can help suggest a firmware version that is more stable (1.17 is stable and out, but features in 1.18 are working and almost ready for release!) and the protocol you would want to use (most people use the Leaf Photosynthesis v1.0, but we have a basic RIDES one that is working with 1.18 if we want to try that!)

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Janina Konarska

submitted 4 months ago.

Hi, One more questions - is it possible to use two protocols at the same time? That would solve the problem with PSI_act missing in the standard protocol...

Best regards, Janina

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Janina Konarska

submitted 4 months ago.

Hello, Many thanks for your answer. I'm using my colleague's instrument, so I will ask him about the firmware version. Regarding the protocol, the standard Leaf Photosynthesis MultispeQ V1.0 nearly suits my needs, but I also need PSI_act. Is there any protocol similar to the standard one, but including it? That wuold be perfect for me and my colleagues :)

Best regards, Janina

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Dan TerAvest

submitted 4 months ago.

Janina,

It is possible to add 2 protocols to a project, in which case the protocols would run back to back, not simultaneously.

Regarding your interest in PS1act, we are working on developing a firmware version that is stable enough to run a new protocol that will run PS1act along with other parameters. Once the firmware and protocol are developed enough for broader testing, we will put out an announcement to members of the community who are interested in testing the new protocols.

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Janina Konarska

submitted 4 months ago.

Hi, Any advice on how to go back to 1.18 from 1.20 (and then back to 1.20 for my colleagues)? I've read I need some hex files, but didn't manage to find them. Thanks in advance!

Best regards, Janina

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Dan TerAvest

submitted 4 months ago.

Janina, I would recommend starting by going back to Firmware version 1.17 first, the hex file can be found here: https://github.com/Photosynq/PhotosynQ-Firmware/releases, just scroll down to version 1.17 and there is a hex file available for download.

After that you can find the most recent version of 1.20 on the same page. However, as Sean mentioned, version 1.20 is a developmental firmware version, so it may have bugs or cause issues with some measurements.

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Janina Konarska

submitted 4 months ago.

Hi, Thanks! I tried to find it myself, but with no success. Now I have 1.17.

One more question about error messages - I did some measurements today (outside, sunny day) and in most cases I got a warning that there was too little incoming radiation or that it varied too much during the measurements. Most of the time the sky was completely clear and each time I made sure the instrument was facing the sun. I deleted the data if the first few rows were 0 or NaN, but I couldn't delete the rest, as this way I would have to delete all entries. Do these warnings mean that the data is worthless? Thanks in advance for some tips on this!

Best regards, Janina

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Dan TerAvest

submitted 4 months ago.

Janina,

I am a little confused, for what parameters are you getting 0 or NaN? I am assuming that the messages you are referring to are for the proton motive force being too noisy or that the light intensity was too low so the values were set to zero. Is that true?

I would not delete data points that have yellow or blue information bars pop up, these are generally to provide the user with information. If a red error message pops up, this generally means that there was a significant problem with the measurement, and that you should retake the measurement.

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Janina Konarska

submitted 4 months ago.

Hello again, I clicked something in the data series by accident, and now my data won't show :( Of course I didn't save the data, so I have no copy. Does anyone know how to recover it? :(

Best regards, Janina

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Sean

submitted 4 months ago.

Hey Janinia,

You can delete and create series at your whim. The data is saved to your project always, so don't even worry about it! Just go and make the series you deleted again :D. We are looking into some of your issues as well :D

-Sean @ PhotosynQ

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Janina Konarska

submitted 4 months ago.

Hi, Thanks for advice. The problem is I can't even access the data - the data loading window doesn't close and everything is greyed out (even thought loading seems to be completed)...

Janina

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Sean

submitted 4 months ago.

hmmmmmm, I would first suggest closing your browser and opening up a new one and trying again,, have you done this?

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Janina Konarska

submitted 4 months ago.

Yes, it doesn't work... I even changed the firmware version back to 1.20 just in case, but it doesn't help... :(((

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Sean

submitted 4 months ago.

interesting, we tried looking at your project from our computers here at the office and things worked just fine. Leads me to believe maybe something is up your computer/internet. Maybe try deleting your cookies

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Janina Konarska

submitted 4 months ago.

It worked, thanks!!!