What is the repeater needed for expanding RS-485 network?

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REpeater in RS-485?

I have PC connected over a Rs-485 network now I want to expand the network Currently I have 5 devices.
To expand the network I heard we should use repeater. What is that repeater. Can anyone please explain??

Regards
Gopi
 

Re: REpeater in RS-485?

Normally you only need a repeater if you have more than 32 devices or more than 4000 feet wirelenght.

Read more for example here:
**broken link removed**

best regards
 

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