user58355: I'm planning to wire a few Arduinos together via RS485, and have one of them act as a hub that collects information from the others and presents it via http on an Ethernet connection. 
For instance an Aduino MKR with ETH shield and 485 shield. Can I expect these to work together? My worry is having 2 shields that potentially need lots of bandwidth, timing issues etc. 

user4143: Should be no problem.
The ETH shield uses SPI to communicate with a W5500 chip. That chip does most of the network processing for you.
The 485 shield just connects to the UART TX and RX pins. It's just serial communications with a couple of control pins from there on out.
Neither use any pins that the other one uses.

58355: <p>I'm planning to wire a few Arduinos together via RS485, and have one of them act as a hub that collects information from the others and presents it via http on an Ethernet connection. </p>

<p>For instance an Aduino MKR with <a href="https://store.arduino.cc/mkr-eth-shield" rel="nofollow noreferrer">ETH shield</a> and <a href="https://store.arduino.cc/arduino-mkr-485-shield" rel="nofollow noreferrer">485 shield</a>. Can I expect these to work together? My worry is having 2 shields that potentially need lots of bandwidth, timing issues etc. </p>
 4143: <p>Should be no problem.</p>

<p>The ETH shield uses SPI to communicate with a W5500 chip. That chip does most of the network processing for you.</p>

<p>The 485 shield just connects to the UART TX and RX pins. It's just serial communications with a couple of control pins from there on out.</p>

<p>Neither use any pins that the other one uses.</p>
