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Posted by Jim Howes on June 30, 2006, 4:53 am
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Greetings,
I am looking to build a building security system using either proximity tags or
swipe cards, connnected to a single-board-computer control system that will
present access logs, and accept authorisation commands from authorised users via
a web browser.
The software side of things, I can deal with. I plan to run the entire thing on
a network of 486-based wafer cards running Linux, provided that this is possible.
What I don't know about is how to interface card readers / prox.tag readers to
these boards. Do these devices usually present some kind of RS-232 interface,
or is it some weird custom thing that I am going to have major difficulties with?
Presumably, the interface presented varies from type to type, so Ideally, I'd
like to find a basic reader that I can talk to / be-talked-to down a serial line.
Any suggestions?
Jim
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Posted by cj on June 30, 2006, 6:56 pm
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Hi Jim
You should not have a problem most retailers supply the software with the
readers which will run on most OS's
Networking is usually via rs232 cat5 or similar (baud rate is only low) .
Try this for a start.
http://www.bewator.com/uk/products/index.xml/AC/AC_RE/AC_RE_SYSTEM_PROXIMITY_COTAG/
HTH
CJ
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Posted by Jim Howes on July 4, 2006, 4:09 am
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> Hi Jim
> You should not have a problem most retailers supply the software with the
> readers which will run on most OS's
From the limited experience of typical "software supplied" I have, it generally
works only they way _they_ expect you to use it. If a device presents a basic
serial stream down an RS-232 link, I can deal with that myself, although I'd be
happier if the full specification was available so I can roll my own code.
I have already built a small flash-bootable linux 'distribution' (it's more like
a kernel built specifically for this 486 board, enough libc to get bash running,
and whatever stuff we want to run on it. Saves a lot of time mucking about with
embedded SDK's and so forth, because if it runs on my desktop box, it will run
on the embedded box. (That, and linux has a select() function which actually
works, unlike a certain Redmondware OS)
> Networking is usually via rs232 cat5 or similar (baud rate is only low) .
> Try this for a start.
>
http://www.bewator.com/uk/products/index.xml/AC/AC_RE/AC_RE_SYSTEM_PROXIMITY_COTAG/
Thanks, will do.
Jim
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