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:
1) Does anyone know where these modules exist and can be bought? 2) If they don't exist, does anyone know a good working circuit that would work? (Data sheet examples are not always the best). 3) 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.