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From: Troy Schultz
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Subject: Re: RS485 help #2
Date: Thu, 24 Oct 2002 14:49:30 GMT
NNTP-Posting-Date: Thu, 24 Oct 2002 10:49:30 EDT
> I designated this #2 as I wanted to start fresh with a new post.....thanks
> for all the response on my previous "RS485 termination" post a few days ago.
> Jim, especially.
> Let me ask this.....
> The fact is, I don't care whether my interface really conforms to a specific
> "standard"...RS232 422 or 485.
> My goal is to have a "star network" (central PIC transmitter with branches).
> I neeed to transfer data at a mere 1200 baud (fact is, it can even go lower)
> to up to 10 PIC receivers, which simply do some switching tasks.
> I need however, to eliminate the EMI emmisions coming from the cable by
> using a balanced connection.
> How about this.....
> Has anyone built their own balanced network using a dual optoisolator (say a
> PS2501-2)at the xmtr and each of the receivers? Couldn't this be done? Just
> split the RS232 coming out of the pic, invert one side and drive the
For some good background information on RS-485 and some of the issues
that you may be up against read the following article;
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