[asterisk-users] RS485 Audio device

Telium Technical Support support at telium.ca
Wed Nov 2 09:48:19 CDT 2016

This one caught my interest too...more out of curiosity!  Keep in mind that
RS485 max speed drops to 100kbps after a relatively short distance.  And,
100kbps is RAW speed.  If you encapsulated your audio stream in that you'd
lose another 10%.

So why are you doing this?  If you are running a 100m cable (4 wire +
shield) why not just pull at cat5/6 cable instead?  Or just send analog
audio over 2 of the wires with the shield to keep out hum.   If there is a
need to use rs485 you could stream your audio over that connection - but I'm
curious why first.

We did some work for broadcast (radio station) doing AoIP and converting
some analog feeds but this seems unusual.


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Matt
Sent: Wednesday, November 02, 2016 10:33 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] RS485 Audio device

On Fri, Oct 28, 2016 at 7:09 PM, Jerry Geis <jerry.geis at gmail.com> wrote:
> Hi All,
> Is there any devices or pair of devices that do audio over RS485
> and then convert to SIP for us in asterisk?
> Of course a speaker and push button at the other end.
> Is there anything like that out there?

Ok, I'll bite.  How does one do audio over RS485?

I've never worked with RS485, but from some brief googling it looks
like it's a fancy version of RS232.  I'm not sure where you'd get
(analog) audio from on RS232.

Matthew Fredrickson
Digium, Inc. | Engineering Manager
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA

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