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Sniffing the Rigol's internal I2C bus

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staze:

--- Quote from: Rigby on December 09, 2013, 07:08:28 pm ---[
--- Quote from: marmad on December 09, 2013, 06:54:36 pm ---I think Rigol designed the new PCBs to be able to be used for filling existing DS2000 orders - while starting up production of the new A and A-S models.
--- End quote ---

Backward compatibility on new hardware does not necessitate forward compatibility on old hardware.  You're probably right, and I think we'll eventually discover a serial number "line in the sand" or board revision where the inclusion of the 50-ohm option starts.

--- End quote ---

Yes, hardware version 2. It HAS the 50ohm terminator... and can be switched on with SPI. We just need to figure out how to enable it in the GUI.

I still have a feeling this is nothing more than the firmware checking the serial number, and enabling options based on that. It's the simplest way programmatically, and it would seem Rigol is all about simple.

NikWing:
but the S-version has extra hardware for the waveform gen I guess? (beside the extra BNC connectors on the back side)

staze:

--- Quote from: NikWing on December 09, 2013, 07:18:50 pm ---but the S-version has extra hardware for the waveform gen I guess? (beside the extra BNC connectors on the back side)

--- End quote ---

Correct.

marmad:

--- Quote from: Rigby on December 09, 2013, 07:08:28 pm ---Are you basing that on anything known?  I mean no offense.  You've been saying this for a while, so clearly you're sure.  I've not seen any proof (enable A features on hardware sold as non-A) yet.

--- End quote ---
Well, I always write 'I believe' or 'I think' - so I'm not absolutely sure. But I'm basing it on posted photos of HW revision 2.0 boards (showing the areas for AWG module add-on) - as well as other reliable information.

Here is a photo of the input stage of DS2000 HW revision 2.0 and 1.0 compared - with the 50 Ohm input resistor and extra relay clearly visible on 2.0 board.

Rigby:

--- Quote from: staze on December 09, 2013, 07:10:31 pm ---I still have a feeling this is nothing more than the firmware checking the serial number, and enabling options based on that. It's the simplest way programmatically, and it would seem Rigol is all about simple.
--- End quote ---

It is equally simple to check the version of a Rigol ASIC or the firmware revision of some other chip, and those things won't be nearly as easy to change post-manufacture.  Sure, you can change how the firmware does the checking, or change the value the firmware looks for, but if the ASIC itself won't enable 50 ohms, changing the firmware won't do much.

edit: i'm being a debbie downer, sorry.

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