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From: Grant Edwards <invalid@invalid.invalid>
Newsgroups: comp.arch.embedded
Subject: Re: RS485 over optical fiber cable
Date: Wed, 31 Oct 2018 14:03:20 +0000 (UTC)
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On 2018-10-31, pozz <pozzugno@gmail.com> wrote:

> I think I need it for 500m link.  Is the usual 120R ok?

The terminating resistor value is chosen to match the cable's
impedance.

-- 
Grant Edwards               grant.b.edwards        Yow! I think my career
                                  at               is ruined!
                              gmail.com