Computer Interfacing
Discussions about interfacing and electronics

RS485 Length Restriction

Safe to go 4500'?


       Computer Interfacing Forum Index -> RS422 and RS485
Author Message

Oct 20, 2009 10:18 pm

Have an application where total line length would be slightly more than the recommended max. length of 4000' (but not by more than about 500 ft). Any experiece going beyond 4000 and how risky is it?

New User

Joined: 06 Jul 2010
Posts: 1

Jul 06, 2010 3:47 pm

Hi, Can anybody explain the diffrance in 4000ft matter if the communication voltage of RS-485 uses 140v instead of 5v?

Oct 19, 2011 2:53 pm

Significantly dropping the signalling speed will take you to 1.5km but your noise margins may decrease.

       Computer Interfacing Forum Index -> RS422 and RS485
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