Switch for RS-485 signals

Hello,

This would depend on the signal you're trying to pass through. Do you have a voltage range and frequency of the signal? These passive FET switches will allow any signal through that meets the recommended operating conditions listed in the datasheet. 
You can search for 2:1 SPDT switches with 2 channels to meet your physical criteria in the TI search tool to see if it fits your BW, voltage, etc needs. 
Let me know the signals you're working with or if you find something on the search tool that seems like a match, you can run it by me and I can help confirm it!

Hope this helps,
Rami