RS-485 + zem?

[Milan]

Ak si dobre pamatam, tak 485 receiver ma def. max. mozny DC offset voci zemi 
/u toho co som niekedy pouzival to bolo tusim okolo 7V/. Takze ak hrozi 
viac, je to na zvazenie. Hlavne medzi budovami to moze byt radovo 10-ky V 
sinus, alebo aj nic.

Milan
----- Original Message ----- 
From: "Dolnsky Pavel" <p.dolnsky@atlas.cz>
To: <hw-list@list.hw.cz>
Sent: Monday, February 01, 2010 2:09 PM
Subject: RS-485 + zem?


Teoreticky nema problema, jde o diferencialni sberniic, jak je to prakticky?
Proc se ptam, potrebuji propojit nekolik zarizeni, ktere jsou napajeny nejen 
z ruznych fazi, ale i z ruznych napajecich soustav a necht byt prekvapen.

Dekuji

Pavel




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