If you're looking to hook up a bus system to your computer,
you probably should go toward CAN.
Sure, there are a lot of old VFD's around, still using Modbus.
I've nothing against modbus, but it is an old hat on it's downhill path,
On the other hand, integrating CAN in linux is not to hard.
But that's not the application I'm talking about.
Sorry if that got lost.
I'm talking about short distances from a controller board to the PC.
Usually a small PCB that hosts IC's like a MCU, DAC, ADC, or another chips
that talks to each other, using a standard protocol used on PCB's.
>
> Without investing much on the subject, my opinion is that Modbus should
> be used. I2C was designed to use low voltage signals over very short
> distances for board level components. Modbus has been designed to work
> in noisy environments over long distances and is commonly used with VFDs
> and PLCs.
>
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