I've just found this wonderful chip that converts SPI to RS485/422 and back again for longer and more EMI tolerant bus runs.
After Googling and looking at specific websites I was surprised that there are no modules on that market that have the chip and support circuitry already set up ready to be used with a microcontroller.
So my question is multi-part:
Does anyone know where these modules exist and can be bought?
If they don't exist, does anyone know a good working circuit that would work? (Data sheet examples are not always the best).
Same as above for I2C
On a side note, I know there are MAX490 modules, but they only process one TTL wire at a time.
Have you tried this circuit? I'm looking for working confirmation of it's reliability not hypothetical.
No, I haven't used the MAX3140 yet. But don't you think that the manufacturer did try it before putting the circuit into the datasheet? If you distrust the datasheets you will have a hard life in the electronics world. I would say it's on you to try that circuit. If it doesn't work you can post your problems here.
That's not what I asked and you know it.
No, I don't know. If I misunderstood your question you probably should ask in a bit more detail, don't you think too?