Re: [Xml1-wire-devel] more on hubs and door locks

[Jac K. <j.k...@th...>]

On Thu, 18 Jan 2001, Bruce Boyes wrote:

> Someone else raised the scenario of a vandal plugging in a OW enabled PC
> into the blue dot reader, looking for DS2406s on all DS2409 branches, and
> turning them on in hopes of activating the door strike. Or plugging 120 VAC
> into the blue dot reader!

The 2409 solved the problem of outside access to other parts of the
one-wire net, but the 230VAC (for us europeans) issue is one that keeps
bugging me. Over a year ago I tried to raise this issue on the one-wire
list, but there was no response at all. Like no-one else cared.

Would it be possible to use some cheap parts (almost like the 2409 but
with some component in the ground connection too) to isolate the reader
from the rest of the net? Or would it be like protecting a transistor with
a fuse? (A transistor protected by a fast-acting fuse will protect the
fuse by blowing first.)

Regards,

Jac

--
 Jac Kersing            Technical Consultant   The-Box Development
 j.k...@th...                         http://www.the-box.com