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Maximum RS485 speed & length in security panels?

Subject: Maximum RS485 speed & length in security panels?
From: kormesii <ilian.costov@xxxxxxxxx>
Date: Mon, 11 Jan 2010 03:23:53 -0800 (PST)
Newsgroups: alt.security.alarms

Hi,
 Does anyone know what is maximum speed and length of RS485 used in
security systems ?
 I know for a panels that use 307k but I really doubt it...

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