Our friends over at LinkSprite have made this nifty little RS485 Shield V3 for the Raspberry Pi, now you will be able to have a communication port for your field bus directly connected to your RPi! Even though the RS485 is sometimes thought as an "archaic" protocol, it will allow up to 32 devices to communicate through the same data line over a cable length of up to 4,000ft with a maximum data rate of 10Mbit/s. Those aren't bad numbers!
This shield comes pre-assembled so all you will need to do is just snap it right onto your Raspberry Pi and get programming. The RS485 Shield V3 is compatible with Raspberry Pi B, B+ and Raspberry Pi 2.
Note: The shield has an unpopulated footprint for a DB9 connector. Check below if you need to add the connector. Otherwise you can use the screw terminals.
The RS485 should work with the Pi 3. Looking at LinkSprite's user guide for RS485 Shield V3, there is a note that it is compatible with the Raspberry Pi 3 => http://linksprite.com/wiki/index.php5?title=RS485/GPIO_Shield_for_Raspberry_Pi_V3.0 . You might need to do some modifications to get it working however => http://www.briandorey.com/post/Raspberry-Pi-3-UART-Boot-Overlay-Part-Two. This comment is in the manufacturer's product page.
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I've just tested this on a Raspberry PI 3, and it works great!
Just keep in mind that the latest version of Raspbian has removed the UART from the gpio on raspberry pi 3, so you need to put it back using a device tree overlay.
I am using it with a modbus device at 115200 with no problems.
Everything works fine - i recommend